Is it permissible for a mother to grant her son a portion of her personal inheritance with the aim of helping him marry, given that his siblings were unable to help him and that she had the right to dispose of this personal money?

Parents must be just and equitable between their children in giving, based on the words of the Prophet, peace and blessings be upon him: "Be equitable between your children in giving" and "Fear Allah and be just between your children." It is permissible to favor some children in giving for a specific need or circumstance, such as a child's need to get married and his inability to bear its expenses, if his siblings have already married.