The only thing I can think of is to get a restraining order to prevent him from being on their property while I am there to help my mother. I have asked him to stop his name calling, screaming and cussing at me to no avail. He can turn on a dime and be sweet as sugar to someone else within a minute after yelling at me so I believe he knows who he can and can not get away with this behavior. It's not going to be me any more. I have tried to talk to my parents about this and nothing comes of it. He is much the same way with my mother. Any advice?