My 87-year-old father in law is convinced that his 46-year-old caregiver is his fiancée (she told a friend she's just pretending to be his fiancée). She has isolated him from all of his family by telling him we don't care about him, and that we are "picking on her" because we don't approve of their relationship due to her age. She has blocked our phone numbers and even called the police telling them lies, saying we want to harm him and take his money. We are heartbroken and afraid for his safety. She's already conned him out of more than $300,000 and has taken control of his bank accounts. We have seen photos of him and he has had several black eyes and other injuries. We called APS and all they did was call his house and ask him, with the girlfriend next to him, if he was okay. He said "yes" so APS said there was nothing they could do. We feel helpless. The woman has installed cameras all over his house and electronically monitors his phone and email and has told him to never answer the phone. Two of my father-in-laws best friends, also in their 80's, tried to visit him and the supposed fiancée called the police and had a restraining order placed on them; she has said that she will do the same to any family member who tries to see him. We feel so helpless and can't believe this is happening. She has totally brainwashed him against the people who love him. What can we do?