Tex. Est. Code § 201.053
(a) A person who purchases for valuable consideration any interest in property of the heirs of a decedent acquires good title to the interest that the person would have received, as purchaser, in the absence of a claim of the child described by Subdivision (1), if the person:
(1) in good faith relies on the declarations in an affidavit of heirship that does not include a child who at the time of the sale or contract of sale of the property:
Added by Acts 2009, 81st Leg., R.S., Ch. 680 (H.B. 2502), Sec. 1, eff. January 1, 2014.