What is the ruling on taking financial interest from a savings account in a post office where a girl's money has been deposited since childhood, and is it permissible to give the forbidden interest to poor and needy relatives?

Usurious benefits from savings accounts are unlawful money, not owned by its holder. It must be spent on general Muslim welfare projects or given to the poor and needy. Its amount can be determined by consulting the post office accounts, or by reasonable estimation if that is not possible. It is permissible to give it to poor relatives for their benefit in legitimate ways such as marriage or education, provided they are poor and in need.