God you sound very bitter and angry. Bottom end is it's your father's house.It may legally be yours since your family seem to have no qualms in getting up to any jiggery pokery to thwart the law when your parents got divorced, but this is your dad's girlfriend because he chose her and you ought to morally consider it your parent's house not yours. If he has a problem then he has to deal with it not you.Go round if you want to, talk to him, chat to him but don't try to dictate who comes to someone's home, that's just control freaky and weird. If she spends money on a hearing aid that's her business, and I wouldn't expect a house guest ( since that's all you say she is) to 'pay her way'- that's absurd and wrong. The judge would laugh you out of court regarding a restraining order, so give up trying to have your own way, respect the fact your father can choose to have who he likes in his own home and make an effort to maintain a good relationship with BOTH of them since I suspect she's here to stay.