The Texas Department of Criminal Justice does not have a sample affidavit available online. This affidavit documents the cohabitation of two individuals for over ten years without being legally married.Outline your shared life: The affidavit asks about how you handled finances, medical decisions, and other critical aspects of your relationship. Download a cohabitation agreement template to describe how you and a nonmarried partner will divide obligations while you live together. Cohabitation: The couple must live together as husband and wife. 5. Commonlaw marriages have very specific requirements. All you have to do is fill out our easy-to-understand questionnaire. The first step in writing a cohabitation agreement is filling in the parties' information. Present the marriage application with just your information filled in on the document. During this period we have professed to be husband and wife and we have held ourselves out to the community as being married. 2.