exmple jquery .children()

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="123">
    <a>123</a>
    <a>123</a>
    <a>123</a>
    <a>123</a>
    <p>123</p>
    <a>123</a>
</div>
<script>
var i = $("#123"),
    h = i.children("p").css("color", "red");
</script>