Is it permissible for the maternal uncle to hit his sister's children for wearing tight clothes in the presence of their father? And will the maternal uncle be held accountable for his sister's children's attire?

The maternal uncle has no guardianship over his sister's daughters as long as their father is alive, sane, accountable, and present; the father is responsible for the care and upbringing of his children. However, the maternal uncle has the responsibility of enjoining good and forbidding evil if he sees something objectionable from his sister's children.

The maternal uncle is not allowed to hit his sister's daughters. Disciplining them through hitting is the right of the father or someone who has guardianship, such as a guardian or an authorized teacher. If the father knows and remains silent, this is considered an endorsement by the father of the maternal uncle's action, becoming like an authorization for him. If the father objects, the maternal uncle should limit himself to offering advice to them, as they have the authority to prevent their daughters from wearing forbidden clothing.