rol evidence or evidence of surrounding facts and circumstances that contradicts or varies the terms of a written instrument may not be considered. HMF Trust v. Bankers Trust Co.. 827 S.W.2d 296.299 (Tenn. Ct. App. 1991): Brown v. Brown. 45 Tenn. App. 78. 95. 320 S.W.2d 721. 728 (1959). In re: Estate of Mar