Is it permissible for me to give one of my children a sum of money as encouragement for obedience, without giving the others?

Question:
He says: Honorable Shaykh, may Allah grant you success. The questioner says to me: I have four sons and one daughter. The eldest is seventeen years old. So, if I give him a sum of money to encourage him in obedience, am I required to give his siblings the same amount?

Answer:
No, it is not permissible. It is not permissible to single him out with a gift. You give his siblings the same: the males the same as him, and the females half. You must be just among them. This is regarding gifts. As for financial maintenance, you provide for each one according to his need. The young one has his maintenance, the older one has his maintenance, and the middle one has his maintenance. This is where equality is required: each according to his need in maintenance. As for gifts and endowments, it is necessary to be equal and just among them. Yes.