Nikah with One's Sister's Daughter and Brother's Daughter

Question

From the standpoint of Islam, is marriage with one's full sister's daughter and one's full brother's daughter permissible or not?

Answer

Nikah with one's full sister's daughter and full brother's daughter is haram. Their prohibition is mentioned at the end of the fourth juz' of the Qur'an.

Source: Fatawa Mahmudiyya

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