vin and title
he is right, if the son wants to he could report the car stolen and have the car confiscated from you.
so time is of the essence, the sooner you figure out the title situation the sooner you can put a halt to him getting dirty with you.
the form i was telling you about was a TR-205 (thats what it shows in the secretary of states online database).....but I don't know what the form would be in your state (or if its even available in your state)