Tex. Fam. Code § 161.1035
An affidavit of relinquishment of parental rights that fails to state that the relinquishment or waiver is irrevocable for a stated time is:
Added by Acts 1997, 75th Leg., ch. 561, Sec. 10, eff. Sept. 1, 1997.
Acts 2007, 80th Leg., R.S., Ch. 1283 (H.B. 3997), Sec. 6, eff. September 1, 2007.