The husband of one’s sister’s daughter is not a mahram

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As-Salaamu-Alaikum wa Rahmatullahi wa Barakatuh. (May Allah's Peace, Mercy and Blessings be upon all of you)
One of our brothers/sisters has asked this question:
With regard to my sister’s daughter’s husband, is it permissible for the to interact with him as I interact with my sister’s sons? What are the boundaries of interacting with him?.
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Answer:
Praise be to Allaah.

The husband of one’s sister’s daughter is not a mahram, rather it is haraam for him to be married to a woman and her paternal or maternal aunt at the same time, because of the report narrated by al-Bukhaari (4821) and Muslim (37) from Abu Hurayrah (may Allah be pleased with him) who said: The Messenger of Allah (blessings and peace of Allah be upon him) said: “It is not permissible to be married to a woman and her paternal or maternal aunt at the same time.” This does not mean that he becomes a mahram to her paternal or maternal aunt, rather he remains a stranger (non-mahram) to them. 

The scholars of the Standing Committee for Issuing Fatwas were asked: 

I have a sister through my mother and father (full sister) and one of her daughters has got married. Is her husband regarded as a mahram to me or not? 

They replied: 

The husband of your sister’s daughter is not regarded as a mahram to you, so it is not permissible for you to shake hands with him or to be alone with him or to travel with him, unlike a mahram. End quote. 

Fataawa al-Lajnah, 17/238 

Based on that, it is not permissible for you to interact with him as you interact with your sister’s sons, because your sister’s sons are mahrams to you, but the husband of your sister’s daughter is not a mahram. 

For more details on who is a woman’s mahram, please see the answer to question no. 5538

And Allah knows best.

Whatever written of Truth and benefit is only due to Allah's Assistance and Guidance, and whatever of error is of me. Allah Alone Knows Best and He is the Only Source of Strength.

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