There are likely no strings attached. Neither payment to you nor your dad is a refund. You likely chose to borrow the maximum amount based on your total anticipated cost of attendance. The amounts paid to you and your dad reflect the amount the school calculated you would need above and beyond the amount actually billed by the school. If you don’t need it, use it to pay down one of the loans you and your dad took. Or save it until you are sure you don’t need it and then pay down a loan.