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Can my brother fix his credit?
In a nutshell, not really.  That's the risk you take when you co-sign for someone.  The lender only made the loan because of the strength of your brother's credit, not your mother's, so his reputation (in the form of his credit rating) is going to take the hit because of his mother's behaviors. The one thing he can do is this:  The credit bureaus allow you to add a comment or explanation to your credit file which may be helpful, provided potential creditors read it, which is never a guarantee.  It's worth trying though, so suggest to him to look into it. Here's a link for him/you/anyone to look at that can help explain how this works and what effects it can have: Adding a comment to your credit file for negative items I hope this helps. Good luck!