40 Tex. Admin. Code §§ 819.191–819.201 § 819.192

(a) Parties to proceedings under this section are the Agency, respondent(s) and any intervenors. Respondents include persons named as such in a charge issued under §819.156. (b) An aggrieved person as defined under Texas Property Code §301.003(1) is not a party but may file a motion to intervene. Requests for intervention shall be filed within 50 days after the issuance of the charge; however, the hearing officer may allow intervention beyond that time. An intervenor's right to participate as a party may be restricted by order of the hearing officer. (c) Intervention shall be permitted if the person requesting intervention is: (1) The aggrieved person on whose behalf the charge is issued; or (2) An aggrieved person who claims an interest in the property or transaction that is the subject of the charge and the disposition of the charge may, as a practical matter, impair or impede this person's ability to protect that interest, unless the aggrieved person is adequately represented by the existing parties. (d) If an aggrieved person does not intervene within 50 days after issuance of the charge, and the parties have reached a settlement, the hearing officer shall dismiss the case.