Is it permissible for the husband to waive a debt owed to him by his mother, which she borrowed to buy a luxurious car, knowing that his wife agreed to the loan on condition of its repayment, and she contributes her money to household expenses, and where is the right of the wife and children in this money?

A wife does not have the right to prevent her husband from lending money from his own wealth to his mother, unless the loan harms her or her children in what is obligatory upon the husband. It is permissible for the son to demand repayment of the debt from his mother if she is solvent, but it is better for him to forgo the demand or to waive the entire debt if that does not harm his wife and children, and this is considered an act of righteousness (birr). The husband must balance the rights of his parents, wife, and children, and give each their due, knowing that the mother's right takes precedence over the wife's right in case of conflict.