Not necessarily, varies by jurisdiction. In some jurisdictions, the underlying legal philosophy is "Wait a second... You really didn't know you had human being

Not necessarily, varies by jurisdiction. In some jurisdictions, the underlying legal philosophy is "Wait a second... You really didn't know you had human beings living on your property? Every person in this neighborhood has a responsibility to know what's going on in their property. The law is therefore not going to lean heavily into your ownership rights if you've been so irresponsible with your ownership that people can just put down roots without your knowledge."