(a) If the regular judge of a family district court is absent or is for any cause disabled or disqualified from presiding, a retired judge of a special juvenile court or a domestic relations court may be appointed by the presiding judge of the administrative judicial region in which the appointed judge resides to sit for the absent, disabled, or disqualified judge of a family district court within the geographic limits of the respective administrative judicial region. To be eligible for the appointment, the retired judge must have voluntarily retired from office and must certify his willingness to serve.
(b) When the docket of a family district court becomes so excessive that the presiding judge of the administrative judicial region in which that court is located considers it an emergency, a retired judge of a special juvenile court or a domestic relations court residing within the geographic limits of the respective administrative judicial region, who meets the qualifications set out in Subsection (a), may be appointed by the presiding judge to sit for the regular judge as long as the emergency exists.

(c) A presiding judge may, with the consent of a retired judge of a special juvenile court or a domestic relations court within his district, make an assignment outside his judicial district with the specific authorization of the presiding judge of the district in which that assignment is made.
(d) A retired judge appointed to sit for a regular judge under this section shall execute the bond and take the oath of office that is required by law for the regular judge for whom he is sitting.
(e) A retired judge appointed under this section has all the power and jurisdiction of the court and the regular judge for whom he is sitting and may sign orders, judgments, decrees, or other process of any kind as presiding judge when acting for the regular judge.
(f) A retired judge appointed to sit for the regular judge under this section shall receive for the services actually performed the same salary that the regular judge is entitled to receive for those services. The amount to be paid for the services shall be paid in the same manner as the regular judge is paid on certification by the presiding judge of the administrative judicial region that the retired judge has rendered the services and is entitled to receive the salary. The payment shall be made from the item in the judiciary section, comptroller‘s department, of the appropriations act providing for payment of salaries of district judges and criminal district judges. This section does not entitle the retired judge of a special juvenile court or a domestic relations court to participate in the Judicial Retirement System of Texas Plan One or the Judicial Retirement System of Texas Plan Two. None of the salary paid to a retired judge sitting for the regular judge may be deducted or paid out of the salary of the regular judge.