Hello again: Please keep in mind that I practice law halfway across the U.S. from you.
That said, I don't know what judgments have already been entered in other cases you mention which might constitute res judicata. In other words, it's already been decided and its all done, legally speaking. If you are now being sued in a Superior Court for possession of property which you now claim to own by way of adverse possession. You would IMO probably want to file both an answer denying the basic allegations of the complaint. Then you would file several counts of counterclaim for; a) Quiet Title against the Plaintiff based on AP; b) quantum meruit, i.e. reasonable value of services rendered (statue of limitations has expired no doubt, but it can still probably be used for counterclaim purposes); c) unjust enrichment.
Of course the Big Kahuna is AP and every state's laws vary considerably. They are fact sensitive, rarely tried and very difficult to win because courts are reluctant to take a person's property away from them. I cannot make any predictions for you based on the facts that you have provided. You might have to go a few counties away to find an attorney, but I think that any good litigator can do it since the law is pretty clear and it's a matter of fact presentation. Plus, most cases like this are going to be settled somewhere along the way. Especially if the facts can cut either way.
These sites present some information that you might find helpful in this area:
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