Tex. Estates Code § 308.004

(a) Not later than the 90th day after the date of an order admitting a will to probate, the personal representative shall file with the clerk of the court in which the decedent's estate is pending a sworn affidavit of the representative or a certificate signed by the representative's attorney stating:

(1) for each beneficiary to whom notice was required to be given under this subchapter, the name of the beneficiary to whom the representative gave the notice or, for a beneficiary described by Section 308.002(b), the name of the beneficiary and of the person to whom the notice was given;

(2) the name of each beneficiary to whom notice was not required to be given under Section 308.002(c)(2), (3), or (4);

(3) the name of each beneficiary whose identity or address could not be ascertained despite the representative's exercise of reasonable diligence; and

(4) any other information necessary to explain the representative's inability to give the notice to or for any beneficiary as required by this subchapter.

(b) The affidavit or certificate required by Subsection (a) may be included with any pleading or other document filed with the court clerk, including the inventory, appraisement, and list of claims, an affidavit in lieu of the inventory, appraisement, and list of claims, or an application for an extension of the deadline to file the inventory, appraisement, and list of claims or an affidavit in lieu of the inventory, appraisement, and list of claims, provided that the pleading or other document is filed not later than the date the affidavit or certificate is required to be filed under Subsection (a).