Marrying one's real sister's milk brother
Q: Is it permissible for a girl to get married to her real sister's milk brother?
A lady named "Aisha" breastfed Muhammad who is her son, and Fathima - who is Aishas sisters daughter.
Fathima has a sister named Zainub, who has not been breastfed by her Khala (Aisha).
Can Muhammad, who is Fathimas milk brother, marry Zainub - who is his milk sister's real sister?