It is mandatory to spend on one’s parents,1455 his grandparents however many generations up, his children and their descendants however many generations down,1456 and those from whom one inherits, whether in the form of designated shares (farḍ) or residuaries (ta‘ṣeeb).1457 This is the case
وَعَلىٰ اْلإِنْسَانِ نَفَقَةُ وَالِدَيْهِ وَإِنْ عَلَوْا، وَأَوْلاَدِهِ وَإِنْ سَفَلُوْا، وَمَنْ يَرِثُهُ بِفَرْضٍ أَوْ تَعْصِيْبٍ، إِذَا كَانُوْا فُقَرَاءَ، وَلَهُ مَا يُنْفِقُ