A vow to give a specific child a gift

Question:
A person says: I vowed to give one of my children a piece of land in exchange for his service and care for me, to the exclusion of his siblings. Is this vow permissible?

Answer:
This is not permissible. Giving a gift to one child to the exclusion of the others is forbidden. The Messenger of Allah (peace and blessings be upon him) said: . Therefore, it is not permissible to give a gift to some of them to the exclusion of the others. If he has given it, he must either take back this gift from him, or give the others the same amount. Yes.