Many forms in Texas are not available in a fillintheblank format. See the links below for the appropriate form or application, and directions to complete the associated document.Once the application has been completed, the process must be completed in person at any of our eight locations listed on the Tarrant County website. You may need to hire a Guardianship Attorney to prepare and file the documents. You may attempt to complete this without an attorney first. This set provides coverage of every aspect of probate law and estate and trust administration in Texas. It includes sample forms and letters. Tarrant County Affidavit of Heirship Form. Fill in the blank form formatted to comply with all recording and content requirements.