Umm Habiba, the daughter of AbuSufyan, reported: The Messenger of Allah (May peace be upon him) came to me and I said to him: Have you any inclination towards me the daughter of Abu Sufyan? He (the Holy Prophet) said: Then what should I do? I said: Marry her. He said: Do you like that? I said: I am not the exclusive (wife) of yours; I, therefore, wish to join my sister in good. He said: She is not lawful for me. I said: I have been informed that you have given the proposal of marriage to Durrah; daughter of Abu Salama He said: You mean the daughter of Umm Salama? I said: Yes. He said: Even if she had not been my step-daughter brought up under my guardianship, she would not have been lawful for me, for she is the daughter of my foster-brother (Hamza), for Thuwaiba had suckled me and her father. So do not give me the proposal of the marriage of your daughters and sisters. This hadith has been narrated on the authority of Hisham with the same chain of transmitters.
Chapter: It is forbidden to marry the step daughter and the sister of the wife (when the wife is alive and not divorced).