Hisham bin 'Urwa هشام بن عروة · The Chapters on Gifts

his father gave him a gift of a slave, and he came to the Prophet (ﷺ) so that he could witness the gift. He said: “Have you given something to all of your children?” He said: “No.” He said: “Then take back (your gift).”

“It is not permissible for a man to give a gift then take it back, except what a father gives to his child.”

the Prophet (ﷺ) ruled that a gift given for life belongs to the heirs (of the recipient).