The occupying co-owner may establish the authority to act as an agent and attorney-in-fact for another co-owner by filing in the office of the county clerk of the county in which the real property is located:
(1) an affidavit of the occupying co-owner affirming the facts described by Sections 65.002(1)-(3);
(2) the affidavits of two additional affiants personally familiar with the co-owner's occupancy of the real property corroborating the occupancy during the preceding five years; and
(3) a certificate of the tax assessor-collector for the county in which the real property is located affirming that the co-owner has paid all taxes assessed against the real property for the preceding five years without delinquency.
Official text of the Texas Property Code as published by the Texas Legislative Council.