Is it permissible for the mother of a minor child to dispose of his money through subscribing to shares or joining a monthly rotating savings and credit association (jam'iyyah) without the knowledge of the legal guardian? And is it permissible for the son to contribute to household expenses given that he has a monthly salary?

Guardianship over a minor's wealth belongs to the father, then to his appointed guardian, then to the judge. The mother has no guardianship over a minor's wealth according to the majority of scholars, and she is not permitted to dispose of it. The guardian must manage the minor's wealth only in a way that serves his predominant interest. It is forbidden for him to donate from it, or to show favoritism, or to exceed customary spending, otherwise, he is liable for what he has disposed of. It is permissible to mix an orphan's wealth with that of his guardian in food, drink, and other matters, for ease and facilitation, as long as the intention is to improve, preserve, and invest the wealth, and that only the necessary expenses of the minor are taken from his money.