If you're engaged or married, you may wish to consider a prenuptial or postnuptial agreement. As Prenuptial Marital Agreement Attorney in Houston, LeLawtx can draft an effective agreement on your behalf.Call for free Consultation: (832) 559-0923. Start your Exchange. Clarifying Ownership: A Partition and Exchange Agreement helps establish clear ownership rights for each spouse. This is a document through which the parties agree that particular property will be "separate property" and will not be divided. Postnuptial agreements are crucial in Texas divorces, dealing with property and child custody. These agreements outline asset and debt division after marriage.