[SOLUTION] How to display a child element while hiding a parent

The goal:
Need to hide a parent <div> (or any object, just using div as an example here), but display its children.

The example html code:
Code:
<div id="parent-div">
<div id="child-div-01">Child Div 01</div>
<div id="child-div-02">Child Div 02</div>
</div>
...