“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.”
قَضَى رَسُولُ اللَّهِ ﷺ أَنَّ أَعْيَانَ بَنِي الأُمِّ يَتَوَارَثُونَ دُونَ بَنِي الْعَلاَّتِ يَرِثُ الرَّجُلُ أَخَاهُ لأَبِيهِ وَأُمِّهِ دُونَ إِخْوَتِهِ لأَبِيهِ