Advance Parole Experience?

Reza-EB2 NIW

Registered Users (C)
Hi everybody,
My sister is a F1 student and she is from Iran. He wants to apply for the Advance Parole to visit our parent because of an emergency situation. We have been told that getting Advance Parole does not guarantee re-entering to USA. Does anybody have any experience about this issue?

Thanks
 
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