How can one deal with a 12.5-year-old brother who is masturbating, given the parents' leniency in monitoring and guiding him, and his rejection of advice, knowing that his sister has prepared an awareness file for him about puberty, masturbation, its harms, the reward of obedience, and the punishment of disobedience, and she wonders whether to give him this file or leave him to grow up spontaneously and ignorantly?

Continue to enjoin your brother to do good and forbid him from evil, and be patient in doing so. Gift him a purposeful, da'wah-oriented disc that appeals to reason and is age-appropriate, and does not contain any Sharia prohibitions, using allusions so that he may accept and benefit from it. Advise your family with a good approach so they may fulfill their role in raising your brother, reminding them of the hadith: "Each of you is a shepherd and each of you is responsible for his flock," and supplicate for them and your brother for guidance.