Abu Musa said that God's Messenger cursed those who separated a parent from his child and a brother from his brother. Ibn Majah and Daraqutni transmitted it.

وَعَن أبي مُوسَى قَالَ: لَعَنَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَنْ فَرَّقَ بَيْنَ الْوَالِدِ وَوَلَدِهِ وَبَيْنَ الْأَخِ وَبَيْنَ أَخِيهِ. رَوَاهُ ابْنُ مَاجَهْ وَالدَّارَقُطْنِيُّ