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A man has 2 wives and from each wife he has 1 daughter. Is it permitted for someone to marry the 2 daughters at one time (who of course have the same father but different mothers)? I am aware that it is not permitted to be married to 2 blood sisters at the same time, but is the case mentioned above slightly different?
Praise be to Allah.
It is not permissible to marry two sisters at the same time, because they are sisters, regardless of whether they share the same father and mother, or they have only one parent in common, because of the verse (interpretation of the meaning):
“Forbidden to you (for marriage) are: … two sisters in wedlock at the same time, except for what has already passed” [An-Nisa’ 4:23]
It was reported from Abu Hurayrah that the Messenger of Allah (peace and blessings of Allah be upon him) forbade marrying a woman then her paternal aunt, or a paternal aunt then her brother’s daughter, a woman then her maternal aunt, or a maternal aunt then her sister’s daughter, or an older sister then the younger sister, or a younger sister then the older sister.” (Narrated by At-Tirmidhi, 1045 and Abu Dawud, 1768. At-Tirmidhi said: it is authentic).
Fayruz Ad-Daylami said: I came to the Prophet (peace and blessings of Allah be upon him) and said: O Messenger of Allah, I have become Muslim and I am married to two sisters. The Messenger of Allah (peace and blessings of Allah be upon him) said: “Choose whichever of them you want [i.e., and divorce the other].” (Narrated by At-Tirmidhi, 1048 and Abu Dawud, 1915, et al.)
For more details, please see the following answers: 127073 , 32689 , 22179 , 22302 , 33711 .
And Allah knows best.