The husband of a sister is not a mahram to his wife's sister
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Question: The third ruling from Fatwa No. ( 10917 )
Q3: The Noble Qur'an states that a man has no right to marry two sisters at the same time. Does this mean that the husband of a woman is a mahram to her sister?
A3: The husband of a woman is not a mahram to her sister; because he is not among her mahrams, and because it is permissible for the husband to marry her sister after he separates from her by death or divorce. The prohibition of marrying two sisters at the same time is due to what may occur of hatred, enmity, and severing of family ties among relatives. And success is from Allah, and may Allah send prayers and blessings upon our Prophet Muhammad, his family, and his Companions.
Q3: The Noble Qur'an states that a man has no right to marry two sisters at the same time. Does this mean that the husband of a woman is a mahram to her sister?
A3: The husband of a woman is not a mahram to her sister; because he is not among her mahrams, and because it is permissible for the husband to marry her sister after he separates from her by death or divorce. The prohibition of marrying two sisters at the same time is due to what may occur of hatred, enmity, and severing of family ties among relatives. And success is from Allah, and may Allah send prayers and blessings upon our Prophet Muhammad, his family, and his Companions.
Source
www.alifta.gov.sa
The Arabic text is copied verbatim from the original source, without any edits.