Jayme

I own a home with someone who also has another property which he rents out. He has stopped paying the mortgage on our home (June 2012) although he still lives in it. He signed a warranty deed on his other home selling it for $10. I am thinking he is filing bankruptcy or something and wants to be able to keep his other house by buying it back from the guy he sold it to once it is over. Is this illegal? If so what is this called? Fraud? Is it similar to tax evasion or something?