getParentFragment returning null

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getParentFragment() was introduced in API level 17 (Android 4.2). Android 4.2 introduced the idea of nested fragments (fragments containing other fragments). Calling this results in null if the fragment has a parent which is an Activity.

Have a look at this.

If you are using support library then you can use getParent(), may be you need to use getChildFragmentManager() while doing fragment transaction.
See this

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