If the husband refuses to pay back the money, he can't sue his wife together. However, if the money borrowed by the husband is used in the daily life of the family during the marriage, it belongs to the joint debt of the husband and wife, and both husband and wife have the responsibility to repay it, and they can sue together with their wives. Legal basis: Article 1064 of the Civil Code stipulates that debts incurred by both spouses with the same signature or ratified by one spouse afterwards, as well as debts incurred by one spouse in his own name for the daily needs of the family during the marriage relationship, belong to the same debts of husband and wife. Debts incurred by one spouse in his own name during the marriage relationship that exceed the needs of family daily life are not joint debts of husband and wife; However, the creditor can prove that the debt is used for the husband and wife's life, production and operation, or based on the same meaning of both husband and wife.