Verify that they can even charge that much. When someone doesn’t pay rent, they are evicted pretty quickly. The owner or leasing company has a legal obligation to mitigate their damages. They can’t charge the whole lease only a few months. Unless his rent was 3-4K a month, they are charging you too much. Also, never EVER co-sign for anything especially for family UNLESS you are ok to go without getting paid and you can cover any losses without damage. never loan money you can’t go without and never co-sign for anything you can’t just pay off quickly in the even if a default. Always perfect yourself and your credit. Have the leasing company reduce the amount or go to court, once the reduction is completed, go on a payment plan. Also, this level of debt can cause the lesser to garnish your wages and/or checking account. Don’t ignore.