You recite: ʿafter the payment of legacies he may have bequeathed or debtsʿ [an-Nisaʿ 4:12]. The Messenger of Allah ﷺ ruled that debts must be paid before carrying out bequests, [And he ruled] that sons from the same father and mother inherit from one another, but sons from different mothers (but the same father) do not. A man inherits from his brother through his father and mother but not from his brother through his father only. (Using translation from Aḥmad 1222)
قَضَى رَسُولُ اللهِ ﷺ أَنَّ الدَّيْنَ قَبْلَ الْوَصِيَّةِ وَأَنْتُمْ تَقْرَءُونَهَا {مِنْ بَعْدِ وَصِيَّةٍ يُوصَى بِهَا أَوْ دَيْنٍ} [النساء 12] وإِنَّ أَعْيَانَ بَنِي الْأُمِّ يَتَوَارَثُونَ دُونَ بَنِي الْعَلَّاتِ يَرِثُ الرَّجُلُ أَخَاهُ لِأَبِيهِ وَأُمِّهِ دُونَ إِخْوَتِهِ لِأَبِيهِ