My dad has always controlled my mom and it continues through her dementia years. Any advice?

He just moved her to a new facility yesterday and told my sister and I we can’t see her for a week because she needs to get used to the surroundings "becaue the dr said."He uses the Dr. thing every minute of every day for one thing or another. He is angry at me and my sister because my mom laughs with us and I believe he is jealous. I contacted the ombudsman assigned to her area because my dad thinks POA means he can control us with our mom. He is 80 and his actions are not helping my mom he seems unstable and does not want my mom's life to be enriched as we do. He tells friends she's terminal and he is looking into hospice. She is not there not close. What do I do about this, do I get someone to do a welfare check on him? He does not have my mom's best interest in mind. Sorry for the book but need some help. Thank you!