What can be done if a mentally incompetent person was duped into signing an auto loan?

Question Details: A woman told my brother that she loved him and that they could get married if he signed paper. It was for a car loan that he was signing but my brother is mentally incompetent. He believed her, of course, and she left him, took the vehicle and is not paying for it. Now, his credit is in jeopardy. I am his sister and his POA but I didn't know anything about this. She told him not to tell me or she would not marry him. How can I get him out of this loan and make her pay for taking advantage of a lonely mentally impaired person.

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