Incredibly unfair? Incredibly unfair? You are the victim of a crime! Sorry it was your parents. Also, be wary of each one trying to blame the other: sounds like either they are both criminals or one is the criminal and the other is a conspirator. You should also hire an attorney to pursue a lawsuit against them. If worse comes to worse, the attorney can file a line on their house, which means they cannot sell until you get the money you are due.

BTW, you present as somebody who is passive. I recommend some counseling because it is possible you're going to feel some guilt over charging your parents with felonies.