ChatGPT and other internet sources may state something along the lines of this relating to what happens if you do not include your SAPCR in a Texas case:

In Texas, SAPCR stands for “Suit Affecting the Parent-Child Relationship,” which is a type of legal action that addresses issues related to child custody, visitation, child support, and other matters involving the parent-child relationship. It is typically filed as a separate lawsuit or included as part of a divorce case when children are involved.

If you do not include the SAPCR in your divorce case in Texas, it means that you may not address important issues related to child custody, visitation, child support, and other matters at the time of the divorce. As a result, the divorce judgment may not provide clear guidelines or orders regarding these issues, which can lead to confusion and potential disputes in the future.

It’s important to understand that child-related matters are typically treated separately from the divorce itself. Filing a SAPCR ensures that these matters are properly addressed and resolved in the best interests of the children involved.

If you realize that you haven’t included the SAPCR in your divorce case, it’s advisable to consult with an attorney who specializes in family law in Texas. They can guide you on the necessary steps to take, such as filing a separate SAPCR or seeking an amendment to the divorce judgment to address child-related issues properly. Each case is unique, so an attorney can provide advice tailored to your specific circumstances.

DO not believe the internet on this question. 

You absolutely have to deal with all questions relating to child custody in your Texas divorce case.  Judges are not strict about all laws, but they are about this one.  If you fail to do this, your case will be re-opened and you will be dealing with your divorce situation again, which no one wants to go through twice.