PROHIBITED DEGREES OF MARRIAGE

According to the Qurʾān they are seven: 1, mother; 2, daughter; 3, sister; 4, paternal aunt; 5, maternal aunt; 6, sister’s daughter; 7, brother’s daughter. And the same with regard to the other sex. It is also unlawful for a Muslim to marry his wife’s sister (see Lev. xviii. 18 ) or his wife’s aunt during the lifetime of his wife. Fosterage in Muslim law establishes relationship, and therefore a foster-sister or a foster-brother is unlawful in marriage. [ MARRIAGE .]