You may want to consider hiring a lawyer to send a Cease-and-Desist letter. While a cease-and-desist letter has little legal impact, the lawyer's letterhead gets the recipient’s attention.
This is a relatively inexpensive way to put the person on notice that you are not going to let these actions continue and that you are serious about pursuing your legal remedies. It also tells the person that they could get in legal hot water which will cost them a lot of legal fees if nothing else. This will often convince them to stop their evil ways.
However, you should consider that sending this type of letter could cause your relationship with your father to be irreperable harmed and make family gatherings very uncomfortable.
Answered on Jan 21st, 2022 at 1:17 PM