diff --git a/dist/temme.js b/dist/temme.js
index caecdbb..f5fde17 100644
--- a/dist/temme.js
+++ b/dist/temme.js
@@ -169,7 +169,10 @@ function _typeof(obj) {
             default: {
                 ref: '',
                 mode: 'append',
-                allowChildren: false
+                children: {
+                    allow: false,
+                    placement: 'after'
+                }
             },
             type: 'object',
             keys: {
@@ -188,18 +191,31 @@ function _typeof(obj) {
                         return mode != null && typeof mode === 'string';
                     }
                 },
-                allowChildren: {
-                    default: false,
-                    type: 'boolean',
-                    isValid: function isValid(allowChildren) {
-                        return allowChildren != null && typeof allowChildren === 'boolean';
-                    }
-                },
-                childrenFirst: {
-                    default: false,
-                    type: 'boolean',
-                    isValid: function isValid(childrenFirst) {
-                        return childrenFirst != null && typeof childrenFirst === 'boolean';
+                children: {
+                    default: {
+                        allow: false,
+                        placement: 'after'
+                    },
+                    type: 'object',
+                    keys: {
+                        allow: {
+                            default: false,
+                            type: 'boolean',
+                            isValid: function isValid(allow) {
+                                return allow != null && typeof allow === 'boolean';
+                            }
+                        },
+                        placement: {
+                            default: 'after',
+                            type: 'string',
+                            values: ['after', 'before'],
+                            isValid: function isValid(placement) {
+                                return placement != null && typeof placement === 'string';
+                            }
+                        }
+                    },
+                    isValid: function isValid(children) {
+                        return children != null && !Array.isArray(children) && _typeof(children) === 'object';
                     }
                 }
             },
@@ -272,12 +288,23 @@ function _typeof(obj) {
         hierarchy['temmeIds'] = Array.from(temmeIds);
         hierarchy['temmeIds'].push(generateTemmeId()); // Populating empty options with defaults.
 
-        for (var _key in options) {
-            if (!(_key in hierarchy)) {
-                if (options[_key].type === 'object') {
-                    hierarchy[_key] = Object.create(options[_key].default);
+        for (var _key2 in options) {
+            if (!(_key2 in hierarchy)) {
+                if (options[_key2].type === 'object') {
+                    hierarchy[_key2] = Object.create(options[_key2].default);
+                } else {
+                    hierarchy[_key2] = options[_key2].default;
+                }
+            } else if (_key2 === 'from') {
+                if (!('children' in hierarchy['from'])) {
+                    hierarchy['from']['children'] = Object.create(options['from']['keys']['children'].default);
                 } else {
-                    hierarchy[_key] = options[_key].default;
+                    // Checking of the object lacks any `from.children` keys and setting the default values.
+                    for (var _key in options['from']['keys']['children']['keys']) {
+                        if (!(_key in hierarchy['from']['children'])) {
+                            hierarchy['from']['children'][_key] = options['from']['keys']['children']['keys'][_key].default;
+                        }
+                    }
                 }
             }
         } // Checking if the element has children.
@@ -370,7 +397,7 @@ function _typeof(obj) {
                                             {
                                                 var _loop = function _loop(k) {
                                                     // Avoiding inheriting the `from`, `name` options.
-                                                    if (!['from', 'ref', 'id', 'name', 'temmeIds', hierarchy['from']['allowChildren'] !== true ? 'children' : ''].includes(k)) {
+                                                    if (!['from', 'ref', 'id', 'name', 'temmeIds', hierarchy['from']['children']['allow'] !== true ? 'children' : ''].includes(k)) {
                                                         switch (options[k].type) {
                                                             case 'array':
                                                                 {
@@ -385,17 +412,32 @@ function _typeof(obj) {
 
                                                                         hierarchy[k] = sanitizedClasses;
                                                                     } else {
-                                                                        // If the children append mode is on `childrenFirst`, meaning
-                                                                        // The referenced object's children should could before the
-                                                                        // referencing object's. Otherwise, the should come after.
-                                                                        if (hierarchy['from']['childrenFirst']) {
-                                                                            var _hierarchy$k;
+                                                                        // If the children's placement is set to `after`, meaning
+                                                                        // The referenced object's children should come after the
+                                                                        // referencing object's. Otherwise, the should come before.
+                                                                        switch (hierarchy['from']['children']['placement']) {
+                                                                            case 'after':
+                                                                                {
+                                                                                    var _hierarchy$k;
+
+                                                                                    (_hierarchy$k = hierarchy[k]).push.apply(_hierarchy$k, _toConsumableArray(reference.refElement[k]));
+
+                                                                                    break;
+                                                                                }
+
+                                                                            case 'before':
+                                                                                {
+                                                                                    var _hierarchy$k2;
+
+                                                                                    (_hierarchy$k2 = hierarchy[k]).unshift.apply(_hierarchy$k2, _toConsumableArray(reference.refElement[k]));
 
-                                                                            (_hierarchy$k = hierarchy[k]).unshift.apply(_hierarchy$k, _toConsumableArray(reference.refElement[k]));
-                                                                        } else {
-                                                                            var _hierarchy$k2;
+                                                                                    break;
+                                                                                }
 
-                                                                            (_hierarchy$k2 = hierarchy[k]).push.apply(_hierarchy$k2, _toConsumableArray(reference.refElement[k]));
+                                                                            default:
+                                                                                {
+                                                                                    throw new TemmeError('InvalidReferencingObject', "\u201C".concat(hierarchy['from']['children']['placement'], "\u201D is an invalid placement."));
+                                                                                }
                                                                         }
                                                                     }
 
@@ -435,7 +477,7 @@ function _typeof(obj) {
                                                 // looping through all the referenced object's options.
                                                 for (var k in reference.refElement) {
                                                     // Avoiding inheriting the `from` and `name.
-                                                    if (!['from', 'ref', 'name', 'temmeIds', hierarchy['from']['allowChildren'] !== true ? 'children' : ''].includes(k)) {
+                                                    if (!['from', 'ref', 'name', 'temmeIds', hierarchy['from']['children']['allow'] !== true ? 'children' : ''].includes(k)) {
                                                         switch (options[k].type) {
                                                             case 'object':
                                                                 {
@@ -515,8 +557,8 @@ function _typeof(obj) {
                                     })[0];
                                 }
 
-                                if (hierarchy['from']['allowChildren'] === true && hierarchy['temmeIds'].includes(reference.refElement['temmeIds'][reference.refElement['temmeIds'].length - 1])) {
-                                    throw new TemmeError('InvalidReference', "Elements cannot reference their parents while “allowChildren” is set to “true”.");
+                                if (hierarchy['from']['children']['allow'] === true && hierarchy['temmeIds'].includes(reference.refElement['temmeIds'][reference.refElement['temmeIds'].length - 1])) {
+                                    throw new TemmeError('InvalidReference', "Elements cannot reference their parents while “from.children.allow” is set to “true”.");
                                 }
 
                                 if (typeof reference !== 'undefined') {
diff --git a/dist/temme.min.js b/dist/temme.min.js
index 6174817..3287c33 100644
--- a/dist/temme.min.js
+++ b/dist/temme.min.js
@@ -1 +1 @@
-"use strict";function _toConsumableArray(e){return _arrayWithoutHoles(e)||_iterableToArray(e)||_nonIterableSpread()}function _nonIterableSpread(){throw new TypeError("Invalid attempt to spread non-iterable instance")}function _iterableToArray(e){if(Symbol.iterator in Object(e)||"[object Arguments]"===Object.prototype.toString.call(e))return Array.from(e)}function _arrayWithoutHoles(e){if(Array.isArray(e)){for(var t=0,r=new Array(e.length);t<e.length;t++)r[t]=e[t];return r}}function _typeof(e){return(_typeof="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}!function(e){var d={temmeIds:{default:[],type:"array",isValid:function(e){return null!=e&&Array.isArray(e)}},name:{default:"div",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},id:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},classes:{default:[],type:"array",isValid:function(e){return null!=e&&Array.isArray(e)}},attributes:{default:{},type:"object",isValid:function(e){return null!=e&&!Array.isArray(e)&&"object"===_typeof(e)}},dataset:{default:{},type:"object",isValid:function(e){return null!=e&&!Array.isArray(e)&&"object"===_typeof(e)}},text:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},html:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},children:{default:[],type:"array",isValid:function(e){return null!=e&&Array.isArray(e)}},ref:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},from:{default:{ref:"",mode:"append",allowChildren:!1},type:"object",keys:{ref:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},mode:{default:"append",type:"string",values:["append","override"],isValid:function(e){return null!=e&&"string"==typeof e}},allowChildren:{default:!1,type:"boolean",isValid:function(e){return null!=e&&"boolean"==typeof e}},childrenFirst:{default:!1,type:"boolean",isValid:function(e){return null!=e&&"boolean"==typeof e}}},isValid:function(e){return null!=e&&!Array.isArray(e)&&"object"===_typeof(e)}}};function u(){var e=0<arguments.length&&void 0!==arguments[0]?arguments[0]:"TemmeError",t=1<arguments.length&&void 0!==arguments[1]?arguments[1]:"Something went wrong.";this.name=e,this.message=t}function a(t,e){for(var r in t){if(!(r in d))throw new u("InvalidOptionNameError","“".concat(r,"” is not a valid option."));if(!d[r].isValid(t[r]))throw new u("InvalidOptionTypeError","The option “".concat(r,"” must be of type ").concat(d[r].type,"."));if("ref"===r&&"@"===t[r].trim()[0])throw new u("InvalidReference","References should not start with the symbole `@`.")}var n,o;for(var i in t.temmeIds=Array.from(e),t.temmeIds.push((n="0123456789abcdefghijklmnopqrstuvwxyz",o="",_toConsumableArray(Array(6).keys()).forEach(function(){var e=Math.floor(Math.random()*n.length),t=Math.floor(2*Math.random());o+=1===t?n[e].toUpperCase():n[e]}),o)),d)i in t||("object"===d[i].type?t[i]=Object.create(d[i].default):t[i]=d[i].default);"children"in t&&t.children.forEach(function(e){a(e,t.temmeIds)})}function t(){var e,t=0<arguments.length&&void 0!==arguments[0]?arguments[0]:{},r=1<arguments.length&&void 0!==arguments[1]?arguments[1]:document.body,n=2<arguments.length&&void 0!==arguments[2]?arguments[2]:function(){},o=3<arguments.length&&void 0!==arguments[3]?arguments[3]:function(e,t,r){};try{if(null==t||"object"!==_typeof(t)||Array.isArray(t))throw new u("InvalidHierarchyError","The hierarchy object is invalid.");if(!(r instanceof HTMLElement))throw new u("InvalidTargetError","The target must be a valid HTML element.");a(t,[]),function t(e,r,n){"ref"in e&&0<e.ref.length&&n.push({refElement:e,depth:r}),"children"in e&&e.children.forEach(function(e){t(e,++r,n)})}(t,0,e=[]),function t(f,s,c){for(var e in f)switch(e){case"from":if(!("ref"in f.from))throw new u("InvalidReferencingObject","The “from” option must have a “ref” key, otherwise, it's invalid");for(var r in f.from){if(!Object.keys(d.from.keys).includes(r))throw new u("InvalidReferencingObject","“".concat(r,"” is an invalid key to have in the “from” option."));if(!d.from.keys[r].isValid(f.from[r]))throw new u("InvalidReferencingObject","“".concat(f.from[r],"” is not a valid value for “").concat(r,"” of the “from” option."));if("values"in d.from.keys[r]&&!d.from.keys[r].values.includes(f.from[r]))throw new u("InvalidReferencingObject","“".concat(f.from[r],"” is not a valid value for “").concat(r,"” of the “from” option."))}0<f.from.ref.length&&function(){var e=function(e){switch(e){case"append":var t=function(r){if(!["from","ref","id","name","temmeIds",!0!==f.from.allowChildren?"children":""].includes(r))switch(d[r].type){case"array":if("children"!==r){var e=a.refElement[r].filter(function(e,t){return!f[r].includes(e)&&a.refElement[r].indexOf(e)===t&&0<e.trim().length}),t=_toConsumableArray(f[r]).concat(_toConsumableArray(e)).sort();f[r]=t}else{var n,o;f.from.childrenFirst?(n=f[r]).unshift.apply(n,_toConsumableArray(a.refElement[r])):(o=f[r]).push.apply(o,_toConsumableArray(a.refElement[r]))}break;case"object":for(var i in a.refElement[r])i in f[r]||(f[r][i]=a.refElement[r][i]);break;default:f[r]=a.refElement[r]}};for(var r in a.refElement)t(r);break;case"override":for(var r in a.refElement)if(!["from","ref","name","temmeIds",!0!==f.from.allowChildren?"children":""].includes(r))switch(d[r].type){case"object":for(var n in a.refElement[r])f[r][n]=a.refElement[r][n];break;default:f[r]=a.refElement[r]}break;default:throw new u("InvalidReferenceMode","“".concat(e,"” is not a valid referencing mode."))}},a={refElement:{},depth:s};if("@"===f.from.ref.trim()[0]){var t=f.from.ref.slice(1),r=document.querySelector(t);if(!(null!=r||r instanceof HTMLElement))throw new u("InvalidReference","No valid HTML element corresponds to the CSS selector “".concat(t,"”"));var n={},o={};for(var i in r.attributes)isNaN(parseInt(i))||["id","class"].includes(r.attributes[i].nodeName)||r.attributes[i].nodeName.startsWith("data-")||(n[r.attributes[i].nodeName]=r.attributes[i].nodeValue);for(var l in r.dataset)o[l]=r.dataset[l];a.refElement={id:r.id,html:r.innerHTML,classes:_toConsumableArray(r.classList),attributes:n,dataset:o}}else a=c.filter(function(e){return e.refElement.ref===f.from.ref&&e.depth<s}).sort(function(e,t){return t.depth-e.depth})[0];if(!0===f.from.allowChildren&&f.temmeIds.includes(a.refElement.temmeIds[a.refElement.temmeIds.length-1]))throw new u("InvalidReference","Elements cannot reference their parents while “allowChildren” is set to “true”.");if(void 0===a)throw new u("InvalidReference","“".concat(f.from.ref,"” is an invalid reference."));"mode"in f.from?e(f.from.mode):e("append")}()}"children"in f&&f.children.forEach(function(e){t(e,++s,c)})}(t,0,e),function n(o,i,a){var l=3<arguments.length&&void 0!==arguments[3]?arguments[3]:function(e,t,r){},e=function(r){switch(r){case"id":o[r]!==d[r].default&&(i.id=o[r]);break;case"classes":if(o[r]!==d[r].default){var e=o[r].filter(function(e,t){return!i.classList.contains(e)&&o[r].indexOf(e)===t&&0<e.trim().length}),t=_toConsumableArray(i.classList).concat(_toConsumableArray(e)).sort().join(" ");i.classList=t}break;case"attributes":o[r]!==d[r].default&&Object.keys(o[r]).forEach(function(e){i.setAttribute(e,o[r][e])});break;case"dataset":o[r]!==d[r].default&&Object.assign(i.dataset,o[r]);break;case"text":o[r]!==d[r].default&&(i.textContent=o[r]);break;case"html":o[r]!==d[r].default&&(i.innerHTML=o[r]);break;case"children":o[r]!==d[r].default&&o.children.forEach(function(e){var t=document.createElement(e.name);i.appendChild(t),n(e,t,++a,l)})}};for(var t in o)e(t);l(o.temmeIds[o.temmeIds.length-1],o,a)}(t,r,0,o),n()}catch(e){throw e.message="[Temme JS]: ".concat(e.message),e}}u.prototype=Error.prototype,"undefined"!=typeof exports?module.exports=t:e.Temme=t}("undefined"!=typeof window?window:void 0);
\ No newline at end of file
+"use strict";function _toConsumableArray(e){return _arrayWithoutHoles(e)||_iterableToArray(e)||_nonIterableSpread()}function _nonIterableSpread(){throw new TypeError("Invalid attempt to spread non-iterable instance")}function _iterableToArray(e){if(Symbol.iterator in Object(e)||"[object Arguments]"===Object.prototype.toString.call(e))return Array.from(e)}function _arrayWithoutHoles(e){if(Array.isArray(e)){for(var t=0,r=new Array(e.length);t<e.length;t++)r[t]=e[t];return r}}function _typeof(e){return(_typeof="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}!function(e){var d={temmeIds:{default:[],type:"array",isValid:function(e){return null!=e&&Array.isArray(e)}},name:{default:"div",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},id:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},classes:{default:[],type:"array",isValid:function(e){return null!=e&&Array.isArray(e)}},attributes:{default:{},type:"object",isValid:function(e){return null!=e&&!Array.isArray(e)&&"object"===_typeof(e)}},dataset:{default:{},type:"object",isValid:function(e){return null!=e&&!Array.isArray(e)&&"object"===_typeof(e)}},text:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},html:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},children:{default:[],type:"array",isValid:function(e){return null!=e&&Array.isArray(e)}},ref:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},from:{default:{ref:"",mode:"append",children:{allow:!1,placement:"after"}},type:"object",keys:{ref:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},mode:{default:"append",type:"string",values:["append","override"],isValid:function(e){return null!=e&&"string"==typeof e}},children:{default:{allow:!1,placement:"after"},type:"object",keys:{allow:{default:!1,type:"boolean",isValid:function(e){return null!=e&&"boolean"==typeof e}},placement:{default:"after",type:"string",values:["after","before"],isValid:function(e){return null!=e&&"string"==typeof e}}},isValid:function(e){return null!=e&&!Array.isArray(e)&&"object"===_typeof(e)}}},isValid:function(e){return null!=e&&!Array.isArray(e)&&"object"===_typeof(e)}}};function u(){var e=0<arguments.length&&void 0!==arguments[0]?arguments[0]:"TemmeError",t=1<arguments.length&&void 0!==arguments[1]?arguments[1]:"Something went wrong.";this.name=e,this.message=t}function l(t,e){for(var r in t){if(!(r in d))throw new u("InvalidOptionNameError","“".concat(r,"” is not a valid option."));if(!d[r].isValid(t[r]))throw new u("InvalidOptionTypeError","The option “".concat(r,"” must be of type ").concat(d[r].type,"."));if("ref"===r&&"@"===t[r].trim()[0])throw new u("InvalidReference","References should not start with the symbole `@`.")}var n,a;for(var i in t.temmeIds=Array.from(e),t.temmeIds.push((n="0123456789abcdefghijklmnopqrstuvwxyz",a="",_toConsumableArray(Array(6).keys()).forEach(function(){var e=Math.floor(Math.random()*n.length),t=Math.floor(2*Math.random());a+=1===t?n[e].toUpperCase():n[e]}),a)),d)if(i in t){if("from"===i)if("children"in t.from)for(var o in d.from.keys.children.keys)o in t.from.children||(t.from.children[o]=d.from.keys.children.keys[o].default);else t.from.children=Object.create(d.from.keys.children.default)}else"object"===d[i].type?t[i]=Object.create(d[i].default):t[i]=d[i].default;"children"in t&&t.children.forEach(function(e){l(e,t.temmeIds)})}function t(){var e,t=0<arguments.length&&void 0!==arguments[0]?arguments[0]:{},r=1<arguments.length&&void 0!==arguments[1]?arguments[1]:document.body,n=2<arguments.length&&void 0!==arguments[2]?arguments[2]:function(){},a=3<arguments.length&&void 0!==arguments[3]?arguments[3]:function(e,t,r){};try{if(null==t||"object"!==_typeof(t)||Array.isArray(t))throw new u("InvalidHierarchyError","The hierarchy object is invalid.");if(!(r instanceof HTMLElement))throw new u("InvalidTargetError","The target must be a valid HTML element.");l(t,[]),function t(e,r,n){"ref"in e&&0<e.ref.length&&n.push({refElement:e,depth:r}),"children"in e&&e.children.forEach(function(e){t(e,++r,n)})}(t,0,e=[]),function t(f,c,s){for(var e in f)switch(e){case"from":if(!("ref"in f.from))throw new u("InvalidReferencingObject","The “from” option must have a “ref” key, otherwise, it's invalid");for(var r in f.from){if(!Object.keys(d.from.keys).includes(r))throw new u("InvalidReferencingObject","“".concat(r,"” is an invalid key to have in the “from” option."));if(!d.from.keys[r].isValid(f.from[r]))throw new u("InvalidReferencingObject","“".concat(f.from[r],"” is not a valid value for “").concat(r,"” of the “from” option."));if("values"in d.from.keys[r]&&!d.from.keys[r].values.includes(f.from[r]))throw new u("InvalidReferencingObject","“".concat(f.from[r],"” is not a valid value for “").concat(r,"” of the “from” option."))}0<f.from.ref.length&&function(){var e=function(e){switch(e){case"append":var t=function(r){if(!["from","ref","id","name","temmeIds",!0!==f.from.children.allow?"children":""].includes(r))switch(d[r].type){case"array":if("children"!==r){var e=o.refElement[r].filter(function(e,t){return!f[r].includes(e)&&o.refElement[r].indexOf(e)===t&&0<e.trim().length}),t=_toConsumableArray(f[r]).concat(_toConsumableArray(e)).sort();f[r]=t}else switch(f.from.children.placement){case"after":var n;(n=f[r]).push.apply(n,_toConsumableArray(o.refElement[r]));break;case"before":var a;(a=f[r]).unshift.apply(a,_toConsumableArray(o.refElement[r]));break;default:throw new u("InvalidReferencingObject","“".concat(f.from.children.placement,"” is an invalid placement."))}break;case"object":for(var i in o.refElement[r])i in f[r]||(f[r][i]=o.refElement[r][i]);break;default:f[r]=o.refElement[r]}};for(var r in o.refElement)t(r);break;case"override":for(var r in o.refElement)if(!["from","ref","name","temmeIds",!0!==f.from.children.allow?"children":""].includes(r))switch(d[r].type){case"object":for(var n in o.refElement[r])f[r][n]=o.refElement[r][n];break;default:f[r]=o.refElement[r]}break;default:throw new u("InvalidReferenceMode","“".concat(e,"” is not a valid referencing mode."))}},o={refElement:{},depth:c};if("@"===f.from.ref.trim()[0]){var t=f.from.ref.slice(1),r=document.querySelector(t);if(!(null!=r||r instanceof HTMLElement))throw new u("InvalidReference","No valid HTML element corresponds to the CSS selector “".concat(t,"”"));var n={},a={};for(var i in r.attributes)isNaN(parseInt(i))||["id","class"].includes(r.attributes[i].nodeName)||r.attributes[i].nodeName.startsWith("data-")||(n[r.attributes[i].nodeName]=r.attributes[i].nodeValue);for(var l in r.dataset)a[l]=r.dataset[l];o.refElement={id:r.id,html:r.innerHTML,classes:_toConsumableArray(r.classList),attributes:n,dataset:a}}else o=s.filter(function(e){return e.refElement.ref===f.from.ref&&e.depth<c}).sort(function(e,t){return t.depth-e.depth})[0];if(!0===f.from.children.allow&&f.temmeIds.includes(o.refElement.temmeIds[o.refElement.temmeIds.length-1]))throw new u("InvalidReference","Elements cannot reference their parents while “from.children.allow” is set to “true”.");if(void 0===o)throw new u("InvalidReference","“".concat(f.from.ref,"” is an invalid reference."));"mode"in f.from?e(f.from.mode):e("append")}()}"children"in f&&f.children.forEach(function(e){t(e,++c,s)})}(t,0,e),function n(a,i,o){var l=3<arguments.length&&void 0!==arguments[3]?arguments[3]:function(e,t,r){},e=function(r){switch(r){case"id":a[r]!==d[r].default&&(i.id=a[r]);break;case"classes":if(a[r]!==d[r].default){var e=a[r].filter(function(e,t){return!i.classList.contains(e)&&a[r].indexOf(e)===t&&0<e.trim().length}),t=_toConsumableArray(i.classList).concat(_toConsumableArray(e)).sort().join(" ");i.classList=t}break;case"attributes":a[r]!==d[r].default&&Object.keys(a[r]).forEach(function(e){i.setAttribute(e,a[r][e])});break;case"dataset":a[r]!==d[r].default&&Object.assign(i.dataset,a[r]);break;case"text":a[r]!==d[r].default&&(i.textContent=a[r]);break;case"html":a[r]!==d[r].default&&(i.innerHTML=a[r]);break;case"children":a[r]!==d[r].default&&a.children.forEach(function(e){var t=document.createElement(e.name);i.appendChild(t),n(e,t,++o,l)})}};for(var t in a)e(t);l(a.temmeIds[a.temmeIds.length-1],a,o)}(t,r,0,a),n()}catch(e){throw e.message="[Temme JS]: ".concat(e.message),e}}u.prototype=Error.prototype,"undefined"!=typeof exports?module.exports=t:e.Temme=t}("undefined"!=typeof window?window:void 0);
\ No newline at end of file
diff --git a/docs/assets/css/main.css b/docs/assets/css/main.css
index d1ee2ae..f0a7e31 100644
--- a/docs/assets/css/main.css
+++ b/docs/assets/css/main.css
@@ -1,7 +1,7 @@
 /**
 *
 * @name:       temmejs
-* @version:    0.4.0
+* @version:    0.4.1
 * @author:     EOussama
 * @license     MIT
 * @source:     https://github.com/EOussama/temmejs
diff --git a/docs/assets/js/lib/temme.min.js b/docs/assets/js/lib/temme.min.js
index 6174817..3287c33 100644
--- a/docs/assets/js/lib/temme.min.js
+++ b/docs/assets/js/lib/temme.min.js
@@ -1 +1 @@
-"use strict";function _toConsumableArray(e){return _arrayWithoutHoles(e)||_iterableToArray(e)||_nonIterableSpread()}function _nonIterableSpread(){throw new TypeError("Invalid attempt to spread non-iterable instance")}function _iterableToArray(e){if(Symbol.iterator in Object(e)||"[object Arguments]"===Object.prototype.toString.call(e))return Array.from(e)}function _arrayWithoutHoles(e){if(Array.isArray(e)){for(var t=0,r=new Array(e.length);t<e.length;t++)r[t]=e[t];return r}}function _typeof(e){return(_typeof="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}!function(e){var d={temmeIds:{default:[],type:"array",isValid:function(e){return null!=e&&Array.isArray(e)}},name:{default:"div",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},id:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},classes:{default:[],type:"array",isValid:function(e){return null!=e&&Array.isArray(e)}},attributes:{default:{},type:"object",isValid:function(e){return null!=e&&!Array.isArray(e)&&"object"===_typeof(e)}},dataset:{default:{},type:"object",isValid:function(e){return null!=e&&!Array.isArray(e)&&"object"===_typeof(e)}},text:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},html:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},children:{default:[],type:"array",isValid:function(e){return null!=e&&Array.isArray(e)}},ref:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},from:{default:{ref:"",mode:"append",allowChildren:!1},type:"object",keys:{ref:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},mode:{default:"append",type:"string",values:["append","override"],isValid:function(e){return null!=e&&"string"==typeof e}},allowChildren:{default:!1,type:"boolean",isValid:function(e){return null!=e&&"boolean"==typeof e}},childrenFirst:{default:!1,type:"boolean",isValid:function(e){return null!=e&&"boolean"==typeof e}}},isValid:function(e){return null!=e&&!Array.isArray(e)&&"object"===_typeof(e)}}};function u(){var e=0<arguments.length&&void 0!==arguments[0]?arguments[0]:"TemmeError",t=1<arguments.length&&void 0!==arguments[1]?arguments[1]:"Something went wrong.";this.name=e,this.message=t}function a(t,e){for(var r in t){if(!(r in d))throw new u("InvalidOptionNameError","“".concat(r,"” is not a valid option."));if(!d[r].isValid(t[r]))throw new u("InvalidOptionTypeError","The option “".concat(r,"” must be of type ").concat(d[r].type,"."));if("ref"===r&&"@"===t[r].trim()[0])throw new u("InvalidReference","References should not start with the symbole `@`.")}var n,o;for(var i in t.temmeIds=Array.from(e),t.temmeIds.push((n="0123456789abcdefghijklmnopqrstuvwxyz",o="",_toConsumableArray(Array(6).keys()).forEach(function(){var e=Math.floor(Math.random()*n.length),t=Math.floor(2*Math.random());o+=1===t?n[e].toUpperCase():n[e]}),o)),d)i in t||("object"===d[i].type?t[i]=Object.create(d[i].default):t[i]=d[i].default);"children"in t&&t.children.forEach(function(e){a(e,t.temmeIds)})}function t(){var e,t=0<arguments.length&&void 0!==arguments[0]?arguments[0]:{},r=1<arguments.length&&void 0!==arguments[1]?arguments[1]:document.body,n=2<arguments.length&&void 0!==arguments[2]?arguments[2]:function(){},o=3<arguments.length&&void 0!==arguments[3]?arguments[3]:function(e,t,r){};try{if(null==t||"object"!==_typeof(t)||Array.isArray(t))throw new u("InvalidHierarchyError","The hierarchy object is invalid.");if(!(r instanceof HTMLElement))throw new u("InvalidTargetError","The target must be a valid HTML element.");a(t,[]),function t(e,r,n){"ref"in e&&0<e.ref.length&&n.push({refElement:e,depth:r}),"children"in e&&e.children.forEach(function(e){t(e,++r,n)})}(t,0,e=[]),function t(f,s,c){for(var e in f)switch(e){case"from":if(!("ref"in f.from))throw new u("InvalidReferencingObject","The “from” option must have a “ref” key, otherwise, it's invalid");for(var r in f.from){if(!Object.keys(d.from.keys).includes(r))throw new u("InvalidReferencingObject","“".concat(r,"” is an invalid key to have in the “from” option."));if(!d.from.keys[r].isValid(f.from[r]))throw new u("InvalidReferencingObject","“".concat(f.from[r],"” is not a valid value for “").concat(r,"” of the “from” option."));if("values"in d.from.keys[r]&&!d.from.keys[r].values.includes(f.from[r]))throw new u("InvalidReferencingObject","“".concat(f.from[r],"” is not a valid value for “").concat(r,"” of the “from” option."))}0<f.from.ref.length&&function(){var e=function(e){switch(e){case"append":var t=function(r){if(!["from","ref","id","name","temmeIds",!0!==f.from.allowChildren?"children":""].includes(r))switch(d[r].type){case"array":if("children"!==r){var e=a.refElement[r].filter(function(e,t){return!f[r].includes(e)&&a.refElement[r].indexOf(e)===t&&0<e.trim().length}),t=_toConsumableArray(f[r]).concat(_toConsumableArray(e)).sort();f[r]=t}else{var n,o;f.from.childrenFirst?(n=f[r]).unshift.apply(n,_toConsumableArray(a.refElement[r])):(o=f[r]).push.apply(o,_toConsumableArray(a.refElement[r]))}break;case"object":for(var i in a.refElement[r])i in f[r]||(f[r][i]=a.refElement[r][i]);break;default:f[r]=a.refElement[r]}};for(var r in a.refElement)t(r);break;case"override":for(var r in a.refElement)if(!["from","ref","name","temmeIds",!0!==f.from.allowChildren?"children":""].includes(r))switch(d[r].type){case"object":for(var n in a.refElement[r])f[r][n]=a.refElement[r][n];break;default:f[r]=a.refElement[r]}break;default:throw new u("InvalidReferenceMode","“".concat(e,"” is not a valid referencing mode."))}},a={refElement:{},depth:s};if("@"===f.from.ref.trim()[0]){var t=f.from.ref.slice(1),r=document.querySelector(t);if(!(null!=r||r instanceof HTMLElement))throw new u("InvalidReference","No valid HTML element corresponds to the CSS selector “".concat(t,"”"));var n={},o={};for(var i in r.attributes)isNaN(parseInt(i))||["id","class"].includes(r.attributes[i].nodeName)||r.attributes[i].nodeName.startsWith("data-")||(n[r.attributes[i].nodeName]=r.attributes[i].nodeValue);for(var l in r.dataset)o[l]=r.dataset[l];a.refElement={id:r.id,html:r.innerHTML,classes:_toConsumableArray(r.classList),attributes:n,dataset:o}}else a=c.filter(function(e){return e.refElement.ref===f.from.ref&&e.depth<s}).sort(function(e,t){return t.depth-e.depth})[0];if(!0===f.from.allowChildren&&f.temmeIds.includes(a.refElement.temmeIds[a.refElement.temmeIds.length-1]))throw new u("InvalidReference","Elements cannot reference their parents while “allowChildren” is set to “true”.");if(void 0===a)throw new u("InvalidReference","“".concat(f.from.ref,"” is an invalid reference."));"mode"in f.from?e(f.from.mode):e("append")}()}"children"in f&&f.children.forEach(function(e){t(e,++s,c)})}(t,0,e),function n(o,i,a){var l=3<arguments.length&&void 0!==arguments[3]?arguments[3]:function(e,t,r){},e=function(r){switch(r){case"id":o[r]!==d[r].default&&(i.id=o[r]);break;case"classes":if(o[r]!==d[r].default){var e=o[r].filter(function(e,t){return!i.classList.contains(e)&&o[r].indexOf(e)===t&&0<e.trim().length}),t=_toConsumableArray(i.classList).concat(_toConsumableArray(e)).sort().join(" ");i.classList=t}break;case"attributes":o[r]!==d[r].default&&Object.keys(o[r]).forEach(function(e){i.setAttribute(e,o[r][e])});break;case"dataset":o[r]!==d[r].default&&Object.assign(i.dataset,o[r]);break;case"text":o[r]!==d[r].default&&(i.textContent=o[r]);break;case"html":o[r]!==d[r].default&&(i.innerHTML=o[r]);break;case"children":o[r]!==d[r].default&&o.children.forEach(function(e){var t=document.createElement(e.name);i.appendChild(t),n(e,t,++a,l)})}};for(var t in o)e(t);l(o.temmeIds[o.temmeIds.length-1],o,a)}(t,r,0,o),n()}catch(e){throw e.message="[Temme JS]: ".concat(e.message),e}}u.prototype=Error.prototype,"undefined"!=typeof exports?module.exports=t:e.Temme=t}("undefined"!=typeof window?window:void 0);
\ No newline at end of file
+"use strict";function _toConsumableArray(e){return _arrayWithoutHoles(e)||_iterableToArray(e)||_nonIterableSpread()}function _nonIterableSpread(){throw new TypeError("Invalid attempt to spread non-iterable instance")}function _iterableToArray(e){if(Symbol.iterator in Object(e)||"[object Arguments]"===Object.prototype.toString.call(e))return Array.from(e)}function _arrayWithoutHoles(e){if(Array.isArray(e)){for(var t=0,r=new Array(e.length);t<e.length;t++)r[t]=e[t];return r}}function _typeof(e){return(_typeof="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}!function(e){var d={temmeIds:{default:[],type:"array",isValid:function(e){return null!=e&&Array.isArray(e)}},name:{default:"div",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},id:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},classes:{default:[],type:"array",isValid:function(e){return null!=e&&Array.isArray(e)}},attributes:{default:{},type:"object",isValid:function(e){return null!=e&&!Array.isArray(e)&&"object"===_typeof(e)}},dataset:{default:{},type:"object",isValid:function(e){return null!=e&&!Array.isArray(e)&&"object"===_typeof(e)}},text:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},html:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},children:{default:[],type:"array",isValid:function(e){return null!=e&&Array.isArray(e)}},ref:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},from:{default:{ref:"",mode:"append",children:{allow:!1,placement:"after"}},type:"object",keys:{ref:{default:"",type:"string",isValid:function(e){return null!=e&&"string"==typeof e}},mode:{default:"append",type:"string",values:["append","override"],isValid:function(e){return null!=e&&"string"==typeof e}},children:{default:{allow:!1,placement:"after"},type:"object",keys:{allow:{default:!1,type:"boolean",isValid:function(e){return null!=e&&"boolean"==typeof e}},placement:{default:"after",type:"string",values:["after","before"],isValid:function(e){return null!=e&&"string"==typeof e}}},isValid:function(e){return null!=e&&!Array.isArray(e)&&"object"===_typeof(e)}}},isValid:function(e){return null!=e&&!Array.isArray(e)&&"object"===_typeof(e)}}};function u(){var e=0<arguments.length&&void 0!==arguments[0]?arguments[0]:"TemmeError",t=1<arguments.length&&void 0!==arguments[1]?arguments[1]:"Something went wrong.";this.name=e,this.message=t}function l(t,e){for(var r in t){if(!(r in d))throw new u("InvalidOptionNameError","“".concat(r,"” is not a valid option."));if(!d[r].isValid(t[r]))throw new u("InvalidOptionTypeError","The option “".concat(r,"” must be of type ").concat(d[r].type,"."));if("ref"===r&&"@"===t[r].trim()[0])throw new u("InvalidReference","References should not start with the symbole `@`.")}var n,a;for(var i in t.temmeIds=Array.from(e),t.temmeIds.push((n="0123456789abcdefghijklmnopqrstuvwxyz",a="",_toConsumableArray(Array(6).keys()).forEach(function(){var e=Math.floor(Math.random()*n.length),t=Math.floor(2*Math.random());a+=1===t?n[e].toUpperCase():n[e]}),a)),d)if(i in t){if("from"===i)if("children"in t.from)for(var o in d.from.keys.children.keys)o in t.from.children||(t.from.children[o]=d.from.keys.children.keys[o].default);else t.from.children=Object.create(d.from.keys.children.default)}else"object"===d[i].type?t[i]=Object.create(d[i].default):t[i]=d[i].default;"children"in t&&t.children.forEach(function(e){l(e,t.temmeIds)})}function t(){var e,t=0<arguments.length&&void 0!==arguments[0]?arguments[0]:{},r=1<arguments.length&&void 0!==arguments[1]?arguments[1]:document.body,n=2<arguments.length&&void 0!==arguments[2]?arguments[2]:function(){},a=3<arguments.length&&void 0!==arguments[3]?arguments[3]:function(e,t,r){};try{if(null==t||"object"!==_typeof(t)||Array.isArray(t))throw new u("InvalidHierarchyError","The hierarchy object is invalid.");if(!(r instanceof HTMLElement))throw new u("InvalidTargetError","The target must be a valid HTML element.");l(t,[]),function t(e,r,n){"ref"in e&&0<e.ref.length&&n.push({refElement:e,depth:r}),"children"in e&&e.children.forEach(function(e){t(e,++r,n)})}(t,0,e=[]),function t(f,c,s){for(var e in f)switch(e){case"from":if(!("ref"in f.from))throw new u("InvalidReferencingObject","The “from” option must have a “ref” key, otherwise, it's invalid");for(var r in f.from){if(!Object.keys(d.from.keys).includes(r))throw new u("InvalidReferencingObject","“".concat(r,"” is an invalid key to have in the “from” option."));if(!d.from.keys[r].isValid(f.from[r]))throw new u("InvalidReferencingObject","“".concat(f.from[r],"” is not a valid value for “").concat(r,"” of the “from” option."));if("values"in d.from.keys[r]&&!d.from.keys[r].values.includes(f.from[r]))throw new u("InvalidReferencingObject","“".concat(f.from[r],"” is not a valid value for “").concat(r,"” of the “from” option."))}0<f.from.ref.length&&function(){var e=function(e){switch(e){case"append":var t=function(r){if(!["from","ref","id","name","temmeIds",!0!==f.from.children.allow?"children":""].includes(r))switch(d[r].type){case"array":if("children"!==r){var e=o.refElement[r].filter(function(e,t){return!f[r].includes(e)&&o.refElement[r].indexOf(e)===t&&0<e.trim().length}),t=_toConsumableArray(f[r]).concat(_toConsumableArray(e)).sort();f[r]=t}else switch(f.from.children.placement){case"after":var n;(n=f[r]).push.apply(n,_toConsumableArray(o.refElement[r]));break;case"before":var a;(a=f[r]).unshift.apply(a,_toConsumableArray(o.refElement[r]));break;default:throw new u("InvalidReferencingObject","“".concat(f.from.children.placement,"” is an invalid placement."))}break;case"object":for(var i in o.refElement[r])i in f[r]||(f[r][i]=o.refElement[r][i]);break;default:f[r]=o.refElement[r]}};for(var r in o.refElement)t(r);break;case"override":for(var r in o.refElement)if(!["from","ref","name","temmeIds",!0!==f.from.children.allow?"children":""].includes(r))switch(d[r].type){case"object":for(var n in o.refElement[r])f[r][n]=o.refElement[r][n];break;default:f[r]=o.refElement[r]}break;default:throw new u("InvalidReferenceMode","“".concat(e,"” is not a valid referencing mode."))}},o={refElement:{},depth:c};if("@"===f.from.ref.trim()[0]){var t=f.from.ref.slice(1),r=document.querySelector(t);if(!(null!=r||r instanceof HTMLElement))throw new u("InvalidReference","No valid HTML element corresponds to the CSS selector “".concat(t,"”"));var n={},a={};for(var i in r.attributes)isNaN(parseInt(i))||["id","class"].includes(r.attributes[i].nodeName)||r.attributes[i].nodeName.startsWith("data-")||(n[r.attributes[i].nodeName]=r.attributes[i].nodeValue);for(var l in r.dataset)a[l]=r.dataset[l];o.refElement={id:r.id,html:r.innerHTML,classes:_toConsumableArray(r.classList),attributes:n,dataset:a}}else o=s.filter(function(e){return e.refElement.ref===f.from.ref&&e.depth<c}).sort(function(e,t){return t.depth-e.depth})[0];if(!0===f.from.children.allow&&f.temmeIds.includes(o.refElement.temmeIds[o.refElement.temmeIds.length-1]))throw new u("InvalidReference","Elements cannot reference their parents while “from.children.allow” is set to “true”.");if(void 0===o)throw new u("InvalidReference","“".concat(f.from.ref,"” is an invalid reference."));"mode"in f.from?e(f.from.mode):e("append")}()}"children"in f&&f.children.forEach(function(e){t(e,++c,s)})}(t,0,e),function n(a,i,o){var l=3<arguments.length&&void 0!==arguments[3]?arguments[3]:function(e,t,r){},e=function(r){switch(r){case"id":a[r]!==d[r].default&&(i.id=a[r]);break;case"classes":if(a[r]!==d[r].default){var e=a[r].filter(function(e,t){return!i.classList.contains(e)&&a[r].indexOf(e)===t&&0<e.trim().length}),t=_toConsumableArray(i.classList).concat(_toConsumableArray(e)).sort().join(" ");i.classList=t}break;case"attributes":a[r]!==d[r].default&&Object.keys(a[r]).forEach(function(e){i.setAttribute(e,a[r][e])});break;case"dataset":a[r]!==d[r].default&&Object.assign(i.dataset,a[r]);break;case"text":a[r]!==d[r].default&&(i.textContent=a[r]);break;case"html":a[r]!==d[r].default&&(i.innerHTML=a[r]);break;case"children":a[r]!==d[r].default&&a.children.forEach(function(e){var t=document.createElement(e.name);i.appendChild(t),n(e,t,++o,l)})}};for(var t in a)e(t);l(a.temmeIds[a.temmeIds.length-1],a,o)}(t,r,0,a),n()}catch(e){throw e.message="[Temme JS]: ".concat(e.message),e}}u.prototype=Error.prototype,"undefined"!=typeof exports?module.exports=t:e.Temme=t}("undefined"!=typeof window?window:void 0);
\ No newline at end of file
diff --git a/docs/assets/js/main.js b/docs/assets/js/main.js
index 1326fd9..981191b 100644
--- a/docs/assets/js/main.js
+++ b/docs/assets/js/main.js
@@ -1,7 +1,7 @@
 /**
 *
 * @name:       temmejs
-* @version:    0.4.0
+* @version:    0.4.1
 * @author:     EOussama
 * @license     MIT
 * @source:     https://github.com/EOussama/temmejs
diff --git a/docs/index.html b/docs/index.html
index 283c554..a07ceaa 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -1,7 +1,7 @@
 <!--
 
     @name:       temmejs
-    @version:    0.4.0
+    @version:    0.4.1
     @author:     EOussama
     @license     MIT
     @source:     https://github.com/EOussama/temmejs
diff --git a/examples/index.html b/examples/index.html
index 53bfb9c..f2dd170 100644
--- a/examples/index.html
+++ b/examples/index.html
@@ -1,7 +1,7 @@
 <!--
 
     @name:       temmejs
-    @version:    0.4.0
+    @version:    0.4.1
     @author:     EOussama
     @license     MIT
     @source:     https://github.com/EOussama/temmejs
@@ -114,28 +114,36 @@
                         from: {
                             ref: 'card-ref',
                             mode: 'override',
-                            allowChildren: true
+                            children: {
+                                allow: true
+                            }
                         }
                     },
                     {
                         from: {
                             ref: 'card-ref',
                             mode: 'override',
-                            allowChildren: true
+                            children: {
+                                allow: true
+                            }
                         }
                     },
                     {
                         from: {
                             ref: 'card-ref',
                             mode: 'override',
-                            allowChildren: true
+                            children: {
+                                allow: true
+                            }
                         }
                     },
                     {
                         from: {
                             ref: 'card-ref',
                             mode: 'override',
-                            allowChildren: true
+                            children: {
+                                allow: true
+                            }
                         }
                     }
                 ]
diff --git a/package.json b/package.json
index 96a8459..231c795 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "temmejs",
-  "version": "0.4.0",
+  "version": "0.4.1",
   "description": "Temme (or Emmet in reverse) is to javascript what Emmet is to HTML and CSS, with no doubts, Emmet saved us from the headache of working with HTML and CSS, and now, Temme is doing Javascript the same favour too.",
   "directories": {
     "doc": "docs",
diff --git a/src/temme.js b/src/temme.js
index eaadb3c..59d5486 100644
--- a/src/temme.js
+++ b/src/temme.js
@@ -1,7 +1,7 @@
 /**
 *
 * @name:       temmejs
-* @version:    0.4.0
+* @version:    0.4.1
 * @author:     EOussama
 * @license     MIT
 * @source:     https://github.com/EOussama/temmejs
@@ -115,7 +115,7 @@
          * The referencing key of the element.
          */
         from: {
-            default: { ref: '', mode: 'append', allowChildren: false },
+            default: { ref: '', mode: 'append', children: { allow: false, placement: 'after' } },
             type: 'object',
             keys: {
                 ref: {
@@ -129,15 +129,23 @@
                     values: ['append', 'override'],
                     isValid: (mode) => mode != null && typeof mode === 'string'
                 },
-                allowChildren: {
-                    default: false,
-                    type: 'boolean',
-                    isValid: (allowChildren) => allowChildren != null && typeof allowChildren === 'boolean'
-                },
-                childrenFirst: {
-                    default: false,
-                    type: 'boolean',
-                    isValid: (childrenFirst) => childrenFirst != null && typeof childrenFirst === 'boolean'
+                children: {
+                    default: { allow: false, placement: 'after' },
+                    type: 'object',
+                    keys: {
+                        allow: {
+                            default: false,
+                            type: 'boolean',
+                            isValid: (allow) => allow != null && typeof allow === 'boolean'
+                        },
+                        placement: {
+                            default: 'after',
+                            type: 'string',
+                            values: ['after', 'before'],
+                            isValid: (placement) => placement != null && typeof placement === 'string'
+                        }
+                    },
+                    isValid: (children) => children != null && !Array.isArray(children) && typeof children === 'object'
                 }
             },
             isValid: (from) => from != null && !Array.isArray(from) && typeof from === 'object'
@@ -209,13 +217,25 @@
         hierarchy['temmeIds'].push(generateTemmeId());
 
         // Populating empty options with defaults.
-        for (let key in options) {
+        for (const key in options) {
             if (!(key in hierarchy)) {
                 if (options[key].type === 'object') {
                     hierarchy[key] = Object.create(options[key].default);
                 } else {
                     hierarchy[key] = options[key].default;
                 }
+            } else if (key === 'from') {
+                if (!('children' in hierarchy['from'])) {
+                    hierarchy['from']['children'] = Object.create(options['from']['keys']['children'].default);
+                } else {
+
+                    // Checking of the object lacks any `from.children` keys and setting the default values.
+                    for (const _key in options['from']['keys']['children']['keys']) {
+                        if (!(_key in hierarchy['from']['children'])) {
+                            hierarchy['from']['children'][_key] = options['from']['keys']['children']['keys'][_key].default;
+                        }
+                    }
+                }
             }
         }
 
@@ -359,8 +379,8 @@
                                 .sort((refA, refB) => refB.depth - refA.depth)[0];
                         }
 
-                        if (hierarchy['from']['allowChildren'] === true && hierarchy['temmeIds'].includes(reference.refElement['temmeIds'][reference.refElement['temmeIds'].length - 1])) {
-                            throw new TemmeError('InvalidReference', "Elements cannot reference their parents while “allowChildren” is set to “true”.");
+                        if (hierarchy['from']['children']['allow'] === true && hierarchy['temmeIds'].includes(reference.refElement['temmeIds'][reference.refElement['temmeIds'].length - 1])) {
+                            throw new TemmeError('InvalidReference', "Elements cannot reference their parents while “from.children.allow” is set to “true”.");
                         }
 
                         if (typeof reference !== 'undefined') {
@@ -388,7 +408,7 @@
                                     for (let k in reference.refElement) {
 
                                         // Avoiding inheriting the `from`, `name` options.
-                                        if (!['from', 'ref', 'id', 'name', 'temmeIds', (hierarchy['from']['allowChildren'] !== true ? 'children' : '')].includes(k)) {
+                                        if (!['from', 'ref', 'id', 'name', 'temmeIds', (hierarchy['from']['children']['allow'] !== true ? 'children' : '')].includes(k)) {
                                             switch (options[k].type) {
                                                 case 'array': {
 
@@ -396,21 +416,33 @@
 
                                                         // Removing any duplicate classes.
                                                         const filteredClasses = reference.refElement[k].filter((cls, index) => !hierarchy[k].includes(cls) && reference.refElement[k].indexOf(cls) === index && cls.trim().length > 0);
-    
+
                                                         // Sorting and concatinating the classes.
                                                         const sanitizedClasses = ([...hierarchy[k], ...filteredClasses]).sort();
-    
+
                                                         // Assigning the classes.
                                                         hierarchy[k] = sanitizedClasses;
                                                     } else {
 
-                                                        // If the children append mode is on `childrenFirst`, meaning
-                                                        // The referenced object's children should could before the
-                                                        // referencing object's. Otherwise, the should come after.
-                                                        if (hierarchy['from']['childrenFirst']) {
-                                                            hierarchy[k].unshift(...reference.refElement[k]);
-                                                        } else {
-                                                            hierarchy[k].push(...reference.refElement[k]);
+                                                        // If the children's placement is set to `after`, meaning
+                                                        // The referenced object's children should come after the
+                                                        // referencing object's. Otherwise, the should come before.
+                                                        switch (hierarchy['from']['children']['placement']) {
+                                                            case 'after': {
+                                                                hierarchy[k].push(...reference.refElement[k]);
+
+                                                                break;
+                                                            }
+
+                                                            case 'before': {
+                                                                hierarchy[k].unshift(...reference.refElement[k]);
+
+                                                                break;
+                                                            }
+
+                                                            default: {
+                                                                throw new TemmeError('InvalidReferencingObject', `“${hierarchy['from']['children']['placement']}” is an invalid placement.`);
+                                                            }
                                                         }
                                                     }
 
@@ -445,7 +477,7 @@
                                     for (let k in reference.refElement) {
 
                                         // Avoiding inheriting the `from` and `name.
-                                        if (!['from', 'ref', 'name', 'temmeIds', (hierarchy['from']['allowChildren'] !== true ? 'children' : '')].includes(k)) {
+                                        if (!['from', 'ref', 'name', 'temmeIds', (hierarchy['from']['children']['allow'] !== true ? 'children' : '')].includes(k)) {
                                             switch (options[k].type) {
                                                 case 'object': {
 
diff --git a/tests/sandbox/index.html b/tests/sandbox/index.html
index 603941b..263f2af 100644
--- a/tests/sandbox/index.html
+++ b/tests/sandbox/index.html
@@ -1,7 +1,7 @@
 <!--
 
     @name:       temmejs
-    @version:    0.4.0
+    @version:    0.4.1
     @author:     EOussama
     @license     MIT
     @source:     https://github.com/EOussama/temmejs
@@ -105,7 +105,10 @@ <h1>Temme JS Sandbox</h1>
                             from: {
                                 ref: 'sibling',
                                 mode: 'append',
-                                allowChildren: false
+                                children: {
+                                    allow: true,
+                                    placement: 'before'
+                                }
                             },
                             classes: ['black'],
                             children: [
diff --git a/tests/temme.test.js b/tests/temme.test.js
index 4badef8..6793eda 100644
--- a/tests/temme.test.js
+++ b/tests/temme.test.js
@@ -1,7 +1,7 @@
 /**
 *
 * @name:       temmejs
-* @version:    0.4.0
+* @version:    0.4.1
 * @author:     EOussama
 * @license     MIT
 * @source:     https://github.com/EOussama/temmejs
@@ -281,7 +281,9 @@ describe('References.', () => {
                         from: {
                             ref: 'ref-1',
                             mode: 'override',
-                            allowChildren: true
+                            children: {
+                                allow: true
+                            }
                         }
                     }
                 ]