Legal Question in Real Estate Law in Wisconsin

Upon what legal theory is he planning to sue you? Errors in your survey? Adverse possession? If I were representing you, I would request clarification from him before planning any next step. A court would never order land to be conveyed just because a neighbor wanted the land; the neighbor would instead need to prove that he had some legal right to it under one of the above theories, or on such grounds as an enforceable contract to sell, inheritance/probate court order, the existence of a valid deed conveying it to him, etc. The list of potential legal theories is endless, but it does not sound like he has presented any of them to you yet. Sorry, but without more information I simply cannot assist you.