The reward for spending on one’s wife and children

Spending On a Wife Who Works

Is it permissible for the wife to save some of her money and her husband’s money without him knowing?

If the husband refuses to spend on his wife’s maintenance, is it permissible for her to refuse to share his bed?

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