Ruling on a wife spending on her husband’s children, and the children spending on their father’s wife

His father gives him money for his university expenses, then there is some extra money left over; is it permissible for him to take it?

Ruling on using the returns on investment certificates for postgraduate education

Does he have to pay zakaat al-fitr on behalf of the orphan whom he is sponsoring?

Does the wife has the right to know about the family budget?

She took some money from her mother when she was still alive without her knowledge, and now she is the only heir

For how long does a father have to spend on his child?

She has both male and female children; who spend on her?

Can a woman donate any of her money without her husband’s permission?

Her husband takes her salary; does she have the right to take from him what she is entitled to without his knowing?