We finally moved my parents into my sister's home after years of trying. My mom's dementia has worsened and we convinced dad that he could no longer live independently and care for mom. He has become increasingly more abusive towards mom (one of the reasons we insisted on the move) and is now starting to physically abusing mom (pull her by the hair, grab her by the face and shake her) even with my sister and her husband right there. They have tried to talk to him but it appears to do no good. Should we call the police when he becomes abusive? We're at our wits end as to how best to handle the situation.