Texas Local Government Code - LOC GOV'T § 232.0048. Conflict of Interest; Penalty

(a) In this section, “subdivided tract” means a tract of land, as a whole, that is subdivided. The term does not mean an individual lot in a subdivided tract of land.

(b) A person has a substantial interest in a subdivided tract if the person:

(c) A person also is considered to have a substantial interest in a subdivided tract if the person is related in the first degree by consanguinity or affinity, as determined under Chapter 573, Government Code, to another person who, under Subsection (b), has a substantial interest in the tract.

(d) If a member of the commissioners court of a county has a substantial interest in a subdivided tract, the member shall file, before a vote or decision regarding the approval of a plat for the tract, an affidavit stating the nature and extent of the interest and shall abstain from further participation in the matter. The affidavit must be filed with the county clerk.

(e) A member of the commissioners court of a county commits an offense if the member violates Subsection (d). An offense under this subsection is a Class A misdemeanor.

(f) The finding by a court of a violation of this section does not render voidable an action of the commissioners court unless the measure would not have passed the commissioners court without the vote of the member who violated this section.