Texas Estates Code - EST § 1104.208. Proof of Declaration

(a) The court may admit a declaration that is self-proved into evidence without the testimony of witnesses attesting to the competency of the declarant and the execution of the declaration.  Additional proof of the execution of the declaration with the formalities and solemnities and under the circumstances required to make it a valid declaration is not necessary.

(b) A declaration described by Section 1104.203(a)(1) that is not self-proved may be proved in the same manner that a will written wholly in the testator's handwriting is proved under Section 256.154.

(c) A declaration described by Section 1104.203(a)(2) that is not self-proved may be proved in the same manner that an attested written will produced in court is proved under Section 256.153.