Live in CA, verbal agreement with rent and bills owed
My husband and I had a verbal agreement to rent from a landlord, and sublet to tennants with permission, who paid partial rent or didn't pay at all, and agreement to half utilities but we were left to pay everything. They incurred substantial debt, then moved out promising verbally to repay but have not. We moved out because we can no longer afford the debt with agreement with the landlord to pay back rent. Can we file a claim against the sublet tenants for their debt owed, even though nothing is in writing?