Saw a video where a guy owned his recentky-passed Dad's house and then squatters moved in.
So he squatted on the squatters. Watched the place and when they were all out of the house got a couple if guys to move their furniture and changed the locks. When the squatters git back he showed his paperwork. When the cops showed he did not open the door and basically said they would have to evict HIM.
It worked but you gotta be tough.