Test Question Fiddle
by jQuery4u
HTML
<ul id='id1'>
<li id='li1'>Items 1</li>
<li id='li2'>Items 2</li>
<li id='li3'>Items 3</li>
</ul>
JavaScript
//console.log($('#id1 li').not($('#li2')));
//console.log($('#li2').siblings());
//console.log($('#id2').siblings('#li2'));
console.log($('#li2').children());
//console.log($('#id2').children('#li2'));