Nikah with One’s Son-in-Law

Question

Zaynab married her daughter to Khalid, and a few days later Zaynab became infatuated with Khalid, that is, her son-in-law; she had him give her daughter a talaq and then married him herself. Will this nikah of hers be valid or not?

Answer

Nikah between a son-in-law and his mother-in-law is haram. ويحرم أم امرأته مطلقا دخل أو لا إن كان العقد صحيحا “And the mother of his wife is forbidden unconditionally, whether he has consummated the marriage or not, if the contract was valid” (“al-Durr al-Muntaqa”, p. 323).

Source: Fatawa Mahmudiyya

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