If his parents want to make the money look like a gift, that will be easy enough. Unless the numbers have changed, each of them can give him $10,000 in a year. And each could give you that much, too, if it came to that.
Don't worry too much about his trouble there. It is his trouble.
I think it might be a good idea to talk to a lawyer though. The sooner you can get assets separated, at least on paper, the more protected you will be from his idiocy!
