Messenger of Allah! to whom should I show kindness? He said: Your mother, your sister, your brother and the slave whom you set free and who is your relative, a due binding (on you), and a tie of relationship which should be joined. (Using translation from Abū Dāʾūd 5140)
أَنَّهُ أَتَى النَّبِيَّ ﷺ فَقَالَ يَا رَسُولَ اللهِ مَنْ أَبَرُّ؟ قَالَ أُمَّكَ وَأَبَاكَ وَأُخْتَكَ وَأَخَاكَ وَمَوْلَاكَ الَّذِي يَلِي ذَلِكَ حَقًّا وَاجِبًا وَرَحِمًا مَوْصُولَةً