Meaning of Milk from Impregnating Agent (the Father)

6. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from Hammad from al-Halabiy who has said the following: “This is concerning my question before abu ‘Abd Allah عليه السلام, about the mother of the child of a man who has breastfed a child and he had a daughter from another woman; if the girl is lawful for that child. He (the Imam) said, ‘I do not like the marriage of the daughter of a man to one who is breastfed from the milk of his children.’”