Tex. Est. Code § 361.103
If letters testamentary or of administration have been granted to a person and another person applies for letters, the court shall revoke the initial letters and grant letters to the second applicant if the second applicant:
Added by Acts 2009, 81st Leg., R.S., Ch. 680 (H.B. 2502), Sec. 1, eff. January 1, 2014.