Is it permissible for a father to give one of his sons something from his wealth to help him in his commercial affairs, while excluding the rest?

Question:
Honorable Shaykh, may Allah grant you success. The questioner says: Is it permissible for a father to give or gift one of his sons something from his wealth because the son helps him in his commercial affairs, while excluding his other sons?

Answer:
No, this is not permissible for him. Rather, he should set a salary for him that is not excessive; he should set a salary for his work, just like the other workers, so that he does not take it on the basis that it is a salary for his work. But if he says, "I will give it to him because he helps me and he is the one who benefits me," no, this is not permissible. Fear Allah and be just among your children. Yes, but if he gives him a salary that is not excessive, it is considered like the other workers. Yes.