"The state that he lives in is Kentucky."
*** Kentucky has the following wage exemption:
"75% of disposable income or 30 times the federal minimum hourly wage (whichever is greater)."
As for domesticating the Texas judgment into Kentucky:
Kentucky Revised Statutes:
"426.955 Filing and status of foreign judgments.
A copy of any foreign judgment authenticated in accordance with the Act of Congress or the statutes of this state may be filed in the office of the clerk of any court of competent jurisdiction of this state. The clerk shall treat the foreign judgment in the same manner as a judgment of any court of this state. A judgment so filed has the same effect and is subject to the same procedures, defenses and proceedings for reopening, vacating, or staying as a judgment of a court of this state and may be enforced or satisfied in like manner."
426.960 Notice of filing.
(1) At the time of the filing of the foreign judgment, the judgment creditor or his lawyer shall make and file with the clerk of the court an affidavit setting forth the name and the last known post office address of the judgment debtor, and the judgment creditor.
(2) Promptly upon the filing of the foreign judgment and the affidavit, the clerk shall mail notice of the filing of the foreign judgment to the judgment debtor at the address given and shall make a note of the mailing in the docket. The notice shall include the name and post office address of the judgment creditor and the judgment creditor's lawyer, if any, in this state. In addition, the judgment creditor may mail a notice of the filing of the judgment to the judgment debtor and may file proof of mailing with the clerk. Lack of mailing notice of filing by the clerk shall not affect the enforcement proceedings if proof of mailing by the judgment creditor has been filed.
(3) No execution or other process for enforcement of a foreign judgment filed hereunder shall issue until twenty (20) days after the date the judgment is filed.
426.965 Stay.
(1) If the judgment debtor shows the court that an appeal from the foreign judgment is pending or will be taken, or that a stay of execution has been granted, the court shall stay enforcement of the foreign judgment until the appeal is concluded, the time for appeal expires, or the stay of execution expires or is vacated, upon proof that the judgment debtor has furnished the security for the satisfaction of the judgment required by the state in which it was rendered.
(2) If the judgment debtor shows the court any ground upon which enforcement of a judgment of any court of this state would be stayed, including the ground that an appeal from the foreign judgment is pending or will be taken, or that the time for taking such an appeal has not yet expired, the court shall stay enforcement of the foreign judgment for an appropriate period until all available appeals are concluded or the time for taking all appeals has expired, upon requiring the same security for satisfaction of the judgment which is required in this state, subject to KRS 411.187.
426.970 Filing fee.
A person filing a foreign judgment shall pay to the clerk of the court the amount as otherwise provided by law for filing suit in the courts of this state.
426.975 Right to bring action unimpaired.
The right of a judgment creditor to bring an action to enforce his judgment instead of proceeding under KRS 426.950 to 426.975 remains unimpaired."
Source for the above:
http://www.lrc.state.ky.us/KRS/426-00/CHAPTER.HTM
Simply contact the Kentucky court (located in his current home county) and ask them what they need to domesticate a Texas judgment. They will advise you to submit an ORIGINAL 'exemplified certified' copy of the Texas judgment to them with a filing fee, affidavit and petition. Send them by certified US mail.