Ruling on a woman wearing the hijab in front of her sister’s husband

Question:
She describes her situation with her sister’s husband, Your Eminence, and says: He has known her since she was a child, and now that she has grown up, she is in a difficult position. Should she cover herself in front of him or not? Especially if he sees her and she wants to cover herself, he starts to tease her and says, “This girl is obedient,” and the like. So what is the guidance of Your Eminence?

Answer:
It is obligatory for you to cover yourself, even if he knew you when you were a child. It is obligatory for you to cover yourself because he is not a mahram. The sister’s husband is not a mahram, and likewise, the uncle’s and aunt’s husbands are not mahrams.
So the point is: It is obligatory for you to cover yourself, and to be cautious of seclusion with him, and of the teasing that may lead to evil. You must maintain the lawful greeting and the lawful, polite speech, and be cautious of being lax regarding the obligation of the hijab. May Allah guide them all.

The presenter : O Allah, amen. May Allah reward you with good, and may He do you good.