Jabir b. 'Abdullah (Allah be pleased with them) reported Messenger of Allah ﷺ as saying: Whoever a person is gifted a life grant, then it is for him (belongs to him and to his posterity, for it belongs to him who has been gven it). It would not return to him who gave it for he conferred it as a gift (it becomes the property of the donee and as such) rules of inheritance will apply to it.

حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنِ ابْنِ شِهَابٍ، عَنْ أَبِي سَلَمَةَ بْنِ، عَبْدِ الرَّحْمَنِ عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ، أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ
" أَيُّمَا رَجُلٍ أُعْمِرَ عُمْرَى لَهُ وَلِعَقِبِهِ فَإِنَّهَا لِلَّذِي أُعْطِيَهَا لاَ تَرْجِعُ إِلَى الَّذِي أَعْطَاهَا لأَنَّهُ أَعْطَى عَطَاءً وَقَعَتْ فِيهِ الْمَوَارِيثُ " .