Tex. Est. Code § 1151.252

An act performed before September 1, 1993, by a guardian of the estate of a person for whom it is necessary to have a guardian appointed to receive and disburse funds that are due the person from a governmental source is validated if the act was performed in conformance with an order of a court that has venue with respect to the support, maintenance, and education of the ward or the ward's dependents and the investment of surplus funds of the ward under this title and if the validity of the act was not an issue in a probate proceeding or civil lawsuit that was pending on September 1, 1993.