Yeah, I have an ex-BiL like that. My sister divorced him, and he managed to talk our parents into putting him up for awhile; he bitched to the rest of our family about the living conditions. Really? I don't know what to tell you, other than to bust his chops when he is talking smack about your family. DON'T take this. If your parents don't know, tell them. If you feel you have to get recorded evidence, do it, within the laws of your state. The guy is a dickasaurus and these should be extinct by now.
If you get to thinking you’re a person of some influence, try ordering somebody else’s dog around.