What is the ruling on fulfilling a mother's request to buy food from young vendors upon returning from university, and what is the ruling on refusing the request by claiming forgetfulness? What is the ruling if there is an alternative or if there is no burden on the siblings? And what is the ruling on dealing with vendors out of necessity, or waiting for siblings to bring the requested item if it is not essential?

If a woman's interaction with sellers does not lead her into temptation (fitna) or something unlawful, then it is permissible out of necessity, while limiting it to what is needed. If it is possible for males to make the purchase, that is preferable. However, if the mother commands her to buy, then obedience to her is obligatory, unless her interaction with sellers would lead her into something unlawful; in that case, there is no obedience to her, and she is permitted to excuse herself from fulfilling her request.