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I cosigned on a house for my brother
He wasn't wrong that a mortgage would help your credit score, assuming that this was a perfect world and everyone held up their end of the bargain. However, now that he hasn't, you are still legally obligated to pay the loan amount (including his portion of it). As for a lawsuit, it would be hard to prove what he said verbally, however, it doesn't hurt to call a lawyer for a free consultation.