What is the ruling on the action of a father who gifted an apartment and a shop to his son and his three daughters, then gifted a sum of money to only two of his daughters, excluding the third daughter and his son, justifying this by the son's disobedience and one of the daughters' ill-treatment?

In Islamic law, a father is required to equalize gifts among his children, unless there is an acceptable justification for preferring some of them. Such justifications include need, chronic illness, engagement in scholarly pursuits, or if another child is a transgressor or uses what they receive to commit sins. This preference is permissible during the father's lifetime as a gift or grant. However, writing a flat for a son, a shop for daughters, and money for some daughters as a will to be executed after death is a bequest to an heir, and it is not enforceable unless the other heirs permit it.