Is it permissible for Muhammad to marry the daughter of a woman nursed by his mother, who is his father's wife, after the death of his brother?

This man who was suckled by your mother is considered your brother through suckling, and it is not permissible for you to marry his daughter, because she is the daughter of your brother through suckling, due to the saying of the Messenger of Allah, peace and blessings be upon him: "What is prohibited by lineage is also prohibited by suckling."