Muhammad bin al-Muthna - al-Zaman محمد بن المثنى أبو موسى - الزمن · 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.”