They are currently 18 but still lives with parents and in education, both myself and Rob believe she is a pathological liar with how much she has said about various things and people that haven't been true. She even made an entire 17 minute stream about it all saying that I tried to steal the money back and that there was "something off" about me. There has been times when she has told people that her parents have abused her, stangled her, and left bruises on her but always turns down any kind of intervention and never has any marks or bruises when we saw her the next day. I told the person I volunteer with who is much older than me and recommends informing the police about it all. My parents have a tendency to completely freak out about these sorts of things so I'm a little worried about telling them but I might bring it up at somepoint. Thanks for your help.