Gator I don't know what that means. That is not the law in most places. I don't know about Texas but no affidavit is required in MS ,ALA or ARK. Have you ever heard the saying "possession is 9/10ths of the law" . If someone has possessed land for the required time in an open , hostile , uninterrupted manner against everyone -- well there you go.

Forget what the RE agent said and talk to a real estate attorney.