What does the lease say about whether the signers are joint and severally liable? Or are they only individually liable? As an example, most individual landlords in a roommate situation will make the signers to the lease joint and severally liable. Meaning they can come after either one for the whole amount. However, in our student housing projects we rent by the bedroom and the parent is a co-signer but only liable for their kid’s portion. Again, without reading the lease, I would suspect that the signers have a duty to pay the whole term of lease rent, but if they move out the landlord probably has an obligation to try to re rent it. But the signers are responsible for rent until the new tenant kicks in and, and leasing costs. But read your lease and see what it says. Then after you know all that I’d call the landlord and just try to talk to them and see if you can work something out. If not, your kiddo may be on the hook for the whole thing. Tough life lesson, but you typically only need to learn it once.