If Child Category checkbox Selected Then Parent checkbox Should be selected Automatically

I have nested Loop For Parent And Child Category, Now I want If My Child Is selected Then All Parent Of that Child Category Should Be Selected Automatically. In My code Only One Parent is checked , So how can i do it. And also If i Uncheck Child Then, Parent Should Be uncheck Automatically So is that possible. Thanks in advance. Here Is My code,

<label>Product Category:</label>
<div class="wk_field wk_category">
<div class="wk_for_validation">
<div id="wk_category_label">CATEGORIES</div>
<div class="wk_cat_container" style="margin-left:0px;">
<span class="wk_minus"> </span>
<span class="wk_foldersign"></span>
<span class="wk_elements wk_cat_name">Gold</span>
<input class="wk_elements" type="checkbox" value="3" name="category[]" id="3">
</div>
<div class="wk_removable wk_cat_container" style="margin-left: 20px;">
<span class="wk_no"></span>
<span class="wk_foldersign"></span>
<span class="wk_elements wk_cat_name">Earrings</span>
<input class="wk_elements" type="checkbox" value="27" name="category[]" onclick="checkParent('3', this)">
</div>
<div class="wk_removable wk_cat_container" style="margin-left: 20px;">
<span class="wk_minusend"></span>
<span class="wk_foldersign"></span>
<span class="wk_elements wk_cat_name">Rings</span>
<input class="wk_elements" type="checkbox" value="26" name="category[]" onclick="checkParent('3', this)" id="26">
</div>
<div class="wk_removable wk_cat_container" style="margin-left: 40px;" >
<span class="wk_no"></span>
<span class="wk_foldersign"></span>
<span class="wk_elements wk_cat_name">Ladies</span>
<input class="wk_elements" type="checkbox" value="37" name="category[]" onclick="checkParent('26', this)">
</div>
<div class="wk_removable wk_cat_container" style="margin-left: 40px;">
<span class="wk_no"></span>
<span class="wk_foldersign"></span>
<span class="wk_elements wk_cat_name">Gents</span>
<input class="wk_elements" type="checkbox" value="36" name="category[]" onclick="checkParent('26', this)">
</div>
<div class="wk_removable wk_cat_container" style="margin-left: 20px;">
<span class="wk_no"></span>
<span class="wk_foldersign"></span>
<span class="wk_elements wk_cat_name">Bangles</span>
<input class="wk_elements" type="checkbox" value="25" name="category[]" onclick="checkParent('3', this)">
</div>

<script type="text/javascript">
function checkParent(id, ele) {
  var parent = document.getElementById(id);
  if (ele.checked === true) parent.checked = true;
}
</script>