37. Spouses shall be severally liable for the reimbursement of benefits unduly paid to their family unless either spouse proves that the ground giving rise to the claim is an act or omission of the other spouse and that he could not reasonably have been aware of it. Spouses shall also be severally liable for the reimbursement of any sum due under paragraphs 2 to 4 of section 34.
The spouse of a person to whom benefits payable to an independent adult or to an adult who is the sole adult of a family have been unduly paid shall be severally liable for the reimbursement of the benefits unless he proves that he could not reasonably have known that his spouse was receiving the benefits or that he did not receive the notice provided for in section 41.