PARTITION. A joint owner or claimant of real property or an interest in real property or a joint owner of personal property may compel a partition of the interest or the property among the joint owners or claimants under this chapter and the Texas Rules of Civil Procedure.
A partition agreement does not have to be approved by the court as just and right. In addition to being in writing and signed by both parties, a partition agreement must either specifically reference “partition” or show the parties' intent to convert the property from community property to separate property.
In short, yes, you should have an attorney to represent you in a postnuptial agreement for several reasons: To be sure you are treated fairly in the agreement. To have the agreement upheld, as a court is much more likely to say it is a valid contract if both parties were represented by counsel when they entered into it.
A partition agreement divides, or partitions, a married couple's community estate into two separate estates. It is sometimes called a post-nuptial or post-marital agreement and is similar to a prenuptial agreement, except that it is executed by a married couple.