Is the son's use of excess money sent by the father in his name to cover specific expenses, with his knowledge of his share and the father's declaration that he will not ask about the surplus, considered consuming ill-gotten wealth?

It is not permissible for a son to take his father's money without his permission and contentment, as long as the father is fulfilling his duty. Accordingly, it is not permissible for the inquiring brother to take the remaining money after the distribution of shares except with his father's permission, or if custom dictates it, or if his father is negligent in his essential expenses and the son is unable to obtain them with his knowledge, provided that he takes only what he needs, for the son is a trustworthy agent. If he is not permitted to take it, he must return it to his father in a manner that preserves affection, and there is no harm if the return is without the father's knowledge.