What is the ruling on my opposing my husband's financial support of his father, even though we are burdened with debts?

If the bank loans are usurious, then the husband should be advised that borrowing with interest is not permissible. Helping the husband's father takes precedence over repaying the debt if it is a mandatory expense. However, if it is a voluntary assistance, then the debt takes precedence because it is obligatory. The husband should help his parents without falling into usury, and the wife should assist him in honoring his parents.