This affidavit documents the cohabitation of two individuals for over ten years without being legally married. Use our I130 affidavit sample and tips to create a strong affidavit for your spouse.Include these key points and avoid common mistakes. A cohabitation agreement is a contract for individuals who live together, outlining their rights and responsibilities. This document serves as a template for cohabitation agreements, outlining the rights and responsibilities of couples living together. What can be Used as Proof of Cohabitation? Misconceptions and complications related to commonlaw marriage often leave employers bewildered about employee benefits for commonlaw spouses. Please be aware that forms will be displayed in a NEW browser window. Each marriage is different, so the information needed to prove that you were separated under the same roof will be different in each case.