Apply for a marriage license, request a copy of your license, or submit an affidavit of absent applicact. The Texas Department of Criminal Justice does not have a sample affidavit available online.County clerk There is a form Affidavit of Informal Marriage that needs to be filled out and submitted''Affidavit of informal marriage tdcj form 2018. This affidavit documents the cohabitation of two individuals for over ten years without being legally married. Once signed, the declaration is valid proof of marriage and you are considered married for all legal purposes. To efile a document, go to eFile Texas at eFiletexas.gov. Below, learn more about e-filing and what is required when e-filing in Texas. This affidavit documents the cohabitation of a couple for over six years without being legally married. Out" element necessary to establishing an informal marriage.