Pursuant to Chapter 4 of the Texas Family Code, parties must enter into a written agreement to change the nature of their property. You need to file the suit in the county and state where the property lies.You need to consult with a property attorney up there. Prenuptial and postnuptial agreements can be valuable tools for many couples. Call a Frisco marital agreement lawyer at 972-294-6533. This is a document through which the parties agree that particular property will be "separate property" and will not be divided. The Texas Family Code authorizes a "marital property agreement" between spouses. Experienced Texas Attorneys Advise on Heirship and Partition Matters. Plano firm handles case involving the severance of jointly owned real estate. Supplemental Instructions for Self-Represented (Pro Se) Litigants.