Contracts

853.13 Contracts. (1) A contract to make a will or devise, not to revoke a will or devise or to die intestate may be established only by any of the following: (a) Provisions of a will stating the material provisions of the contract. (b) An express reference in a will to a contract and extrinsic evidence proving the terms of the contract. (c) A valid written contract, including a marital property agreement under s. 766.58 (3) (e). (d) Clear and convincing extrinsic evidence. (2) The execution of a joint will or mutual wills does not create a presumption of a contract not to revoke the will or wills.