JSFiddle - React, Tailwind, and code Playground
HTML
<div class="parent">
<div id="child1">Content here</div>
<div class="child2">Content here</div>
</div>
JavaScript
$("#child1").parent().wrapInner("<div id='holder'>");
<div class="parent">
<div id="child1">Content here</div>
<div class="child2">Content here</div>
</div>
$("#child1").parent().wrapInner("<div id='holder'>");