What is my recourse if I recently bought a car without the seller disclosing that the car was salvaged?

Question Details: I helped my mother buy a car from a supposed "friend" of the family. He never disclosed that the vehicle was salvaged. He wanted the high blue book value and requested a cashier's check. When we had the check in hand, we sat down to fill out the paperwork. I never noticed the the title said damaged on it, since I trusted this individual. My mother is 83 years old and has lapse of memory. When she went to register the car, she found that it was salvaged. I did not go with her and she did not understand too well as English is not her primary language. She did what she was told, including going to get it smogged because that was not done either. She then registered the vehicle. When she told me, I immediately called the seller. It's been almost a week now with me going back and forth with them. He is using excuse after excuse to not pay the full amount even though he agrees to one thing and then comes back trying to negotiate the price down. We paid $5,000 for a used car plus $50 for a smog certificate and $403 for the registration. $We've gone back and forth over the registration. I've tried splitting it in half, then just agreeing to $5,000 plus $50 smog certificate. He instead is accusing my mother of causing $2,700 in damages to the car which he says that he'll overlook so long as we pay to register the car back in his name. Do we have a case? I cannot trust what this man is saying at all nor agreeing to since he seems to keep on trying to lower the amount that he has to return to us. The car is worth at most $2,500 being that it's salvaged. Bottom line, wasn't it his obligation to tell me?

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