Breastfeeding: does it make unlawful what lineage makes unlawful?

Sayyiduna Ibn Abbas (may Allah be pleased with them both) says: The Prophet (peace and blessings be upon him) was asked to marry the daughter of Sayyiduna Hamzah bin Abd al-Muttalib (may Allah be pleased with him). He said: "She is the daughter of my foster brother, and the relations that are unlawful through lineage become unlawful through suckling as well."

Sayyiduna Ali (may Allah be pleased with him) says: I said: O Messenger of Allah, why is it that you are keen on marrying among Quraysh and leave us aside? He (peace and blessings be upon him) said: "Do you have someone (suitable)?" I said: Yes, the daughter of Sayyiduna Hamzah (may Allah be pleased with him). The Messenger of Allah (peace and blessings be upon him) said: "She is not lawful for me, for she is the daughter of my foster brother."

Sayyidah Aishah (may Allah be pleased with her) says: Once my foster uncle, Aflah bin Abi al-Qu'ays, came to me. By then the commands of hijab had been revealed. He asked permission to come in, and I refused him. Then the Messenger of Allah (peace and blessings be upon him) came and said: "He is your uncle; give him permission to visit you." Sayyidah Aishah (may Allah be pleased with her) said: It was the woman who suckled me; the man did not suckle me. The Prophet (peace and blessings be upon him) said: "You have said a strange thing."

Sayyidah Umm Salamah (may Allah be pleased with her) says: Sayyidah Umm Habibah (may Allah be pleased with her) said to the Prophet (peace and blessings be upon him): O Messenger of Allah, would you like to marry my sister, the daughter of Abu Sufyan? The Prophet (peace and blessings be upon him) said: "She is not lawful for me." Sayyidah Umm Habibah said: It has reached me that you have proposed to Durrah bint Abi Salamah. The Prophet (peace and blessings be upon him) asked: "The daughter of Umm Salamah?" She said: Yes. The Prophet (peace and blessings be upon him) said: "By Allah, even if she were not being raised in my care, she would not be lawful for me, because she is the daughter of my foster brother. Thuwaybah suckled both me and her father. So do not offer me your sisters and daughters in marriage."

The view of Sayyidah Aishah (may Allah be pleased with her) was that the relations that are unlawful through lineage become unlawful through suckling as well.

Sayyiduna Ali (may Allah be pleased with him) says: Do not marry a woman whom your brother's wife has suckled, nor one whom your father's wife has suckled, nor one whom your son's wife has suckled.

Sayyiduna Ibn Abbas (may Allah be pleased with them both) says: The relations that are unlawful through lineage become unlawful through suckling as well.

Ibrahim says: The relations that are unlawful through lineage become unlawful through suckling as well.

Sayyiduna Abdullah (may Allah be pleased with him) says: The relations that are unlawful through lineage become unlawful through suckling as well.

It is narrated from Sayyidah Aishah (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) said: "The relations that are unlawful through lineage become unlawful through suckling as well."

Suwayd bin Ghafalah says: The relations that are unlawful through lineage become unlawful through suckling as well.

Sayyiduna al-Bara' (may Allah be pleased with him) says: It was said to the Prophet (peace and blessings be upon him): Will you marry the daughter of Sayyiduna Hamzah (may Allah be pleased with him)? He said: "She is not lawful for me. She is the daughter of my foster brother."