Blank forms to print and fill out on your own, with how-to instructions for completing and filing. You must still fill out and file the Acknowledgment of Parentage.Don't list more than one child unless they have all the same parents or possible parents. Step 1 – Fill in the information of both parties. The first step in writing a cohabitation agreement is filling in the parties' information. Cohabitation Agreements: For couples not in a legally recognized common law marriage, property rights are more ambiguous. Most counties will not enter final dissolution orders without also entering a parenting plan and order on child support. Unmarried Washington couples who've lived together in committed intimate relationships have some legal rights and duties that are similar to married couples. We aren't married, but don't I have any rights? That is absolutely not true.