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How to select child elements in jquery in Jquery functions of JQuery Examples
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Note 
First of all understand about which is parent element,Child element and siblings element.

children() function used to select the child element of parent element.
Example 1 : when you click the parent element the css applied to the corresponding child element

Related topics:

parent() function is used to select the parent element of child element.
Example 2: when you click the child element the css applied to the corresponding parent element.

siblings() function used to select the sibling elements of parent element.
Example 3 : when you click the sibling element the css applied to the corresponding all siblings element.
Example 1 : when you click the parent element the css applied to the corresponding child element
<html>

<head>
    <title>HTML-JQuery</title>
    <script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>

    <script type="text/javascript">
        $(function () {
            $(".parent").click(function () {
                $(this).children().css("color", "red");
            });
        });
    </script>

</head>

<body>
    <div class="parent">
        <div class="child">childOne</div>
        <div class="child">childTwo</div>
    </div>
</body>

</html>
Example 2: when you click the child element the css applied to the corresponding parent element
<html>

<head>
    <title>HTML-JQuery</title>
    <script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>

    <script type="text/javascript">
        $(function () {
            $(".child").click(function () {
                $(this).parent().css("color", "red");
            });
        });
    </script>

</head>

<body>
    <div class="parent">
        <div class="child">childOne</div>
        <div class="child">childTwo</div>
    </div>
</body>

</html>
Example: 1 Demo 
click here for demo
Example: 2 Demo 
Click here to see Demo
Example 3 : when you click the sibling element the css applied to the corresponding all siblings element
<html>

<head>
    <title>HTML-JQuery</title>
    <script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>

    <script type="text/javascript">
        $(function () {
            $(".child").click(function () {
                $(this).siblings().css("color", "red");
            });
        });
    </script>

</head>

<body>
    <div class="parent">
        <div class="child">siblingOne</div>
        <div class="child">siblingTwo</div>
        <div class="child">siblingThree</div>
        <div class="child">siblingFour</div>
    </div>
</body>

</html>
Example: 3 Demo 
Click here to see Demo
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