Sa'id ibn al-Musayyib سعيد بن المسيب بن حزن أبو محمد القرشي · Chapters on Shares of Inheritance

“The Messenger of Allah (ﷺ) ruled that the sons from the same mother inherit from one another, but not sons from different mothers. A man inherits from his full brother from the same father and mother, but not his brothers from his father.”

“Whoever commits adultery with a slave woman or a free woman, his child is illegitimate, and he cannot inherit from him or be inherited from (i.e., this child cannot inherit from him).”