Adverse possession can be a complicated issue. In Texas there are several ways to prove adverse possession. Although I handle mostly criminal defense now, I have handled a lot of real estate litigation in my career. Many attorneys like myself offer free consultations. You need to spend some time consulting with an attorney regarding this case. You may call me of you wish.
Todd Steele's response to your question is for general information purposes only. Nothing in this response should be taken as legal advice for any individual case or situation. This information is not intended to create, and receipt or viewing does not constitute, an attorney-client relationship.