<title>jQuery Demo example</title>
<script type="text/javascript" src="http://code.jquery.com/jquery-2.1.4.min.js">
<script type="text/javascript">
$(document).ready(function(){
$( "#siblingsExample" ).on( "click", function(event) {
$(".my-siblings").siblings().css({"border":"1px solid red","background":"yellow"});
<li class='level-two'> Second Item</li>
<li class="my-siblings"> Third Item (Find my Siblings)</li>
<h4><a href="javascript:void(0);" id="siblingsExample">Click to run siblings() Example </a></h4>