Tex. Est. Code § 1057.001
(a) A guardian may change the guardian's resident agent to accept service of process in a guardianship proceeding or other matter relating to the guardianship by filing with the court in which the guardianship proceeding is pending a statement titled "Designation of Successor Resident Agent" that states the names and addresses of:
Added by Acts 2011, 82nd Leg., R.S., Ch. 823 (H.B. 2759), Sec. 1.02, eff. January 1, 2014.