Modify a Texas
custody order.

What “modification”
actually changes.

A modification updates an existing Texas custody order to reflect what has actually changed since the order was signed. The court that issued the original order keeps the case, the case number stays the same, and the judge is often the same judge. What changes are specific provisions — possession schedule, primary residence, decision-making rights, support calculation — not the underlying decree.

A modification is not a re-litigation of the divorce. The divorce is over. You are asking the same court to update a piece of the order because the family the order was written for has changed. Texas presumes the original was right when it was signed, and § 156.101 sets the standard for proving it should not be right anymore.

The “material and
substantial change”
standard.

The cornerstone phrase in Texas custody modification is “material and substantial change in circumstances.” Under § 156.101, the court can modify a conservatorship or possession order under one of three triggers: a material and substantial change in circumstances since the last order, a child age 12 or older who has expressed a written preference, or a parent who has voluntarily relinquished primary care for at least six months.

The first trigger does most of the work in practice. The statute does not define “material and substantial” — case law has filled in the edges. Two showings are required and both have to land: the change occurred since the last order, AND the proposed new arrangement serves the child’s best interest. Most modifications are won or lost on whether the first showing is well-documented enough to take seriously.

What qualifies —
and what does not.

Courts in Travis, Williamson, and Hays counties consistently accept these as material and substantial:

• A meaningful income change for either parent
• A relocation that disrupts the existing possession schedule
• A child’s developmental, medical, or educational needs shifting in a way the current order does not accommodate
• A parent’s incarceration, serious illness, or substance-use disorder
• The remarriage of either parent, when the new household materially affects the child

What courts generally will not treat as a material change:

• Ordinary disagreement with the existing order
• A new partner you do not approve of
• A single bad weekend or isolated incident
• A parenting choice you disagree with that is not a safety issue
• “They have moved on with someone I do not like”

Lifestyle disapproval is not a change in circumstances. Documented patterns of behavior that affect the child are.

The 1-year
affidavit rule.

If the order you want to modify is less than one year old, § 156.102 requires an affidavit explaining why an immediate change is necessary. The bar is meaningful — usually that the child’s present environment endangers physical health or emotional development, or that the parties have already agreed to the change in writing.

Without that affidavit, the court will not even hear the request inside the first year. After the one-year mark, the standard one-trigger rule from § 156.101 applies on its own.

This rule exists to prevent post-decree re-litigation. Most orders need at least one update before the children are grown; very few legitimately need that update inside the first year.

Child preference,
age 12 and up.

Under § 156.101, a child age 12 or older can express a preference for which parent has primary custody, and the court may consider that preference when deciding whether to modify. The mechanism is usually an in-chambers interview with the judge — quieter and less adversarial than open-court testimony.

Preference is one factor, not a vote. The court still has to find the change is in the child’s best interest. A 14-year-old who wants to live with one parent because the high school is closer is a real consideration; a 14-year-old whose preference is driven by which house has fewer rules is a different conversation. Courts are particularly attentive to whether the preference looks coached, which is why how the preference was expressed — to whom, over what period, in what circumstances — often matters as much as what was said.

Building the case —
what to document.

Documentation beats testimony every time. The patterns that move courts are the patterns the court can see in writing.

For work-related changes: employment contracts, termination letters, pay stubs, supervisor letters about schedule requirements, travel records.

For relocation cases: the job offer in writing, school research and admissions records, housing arrangements at the new location, a concrete plan for maintaining the other parent’s relationship with the child.

For child-safety concerns: police reports, protective orders, medical records, school counselor reports, therapy records (with proper authorization).

For preference situations: the child’s own writing when it exists, contemporaneous records of the preference expressed to teachers or counselors, documentation of specific problems with the current arrangement.

The single biggest mistake people make is waiting to start. Begin documenting the moment you notice the change. A pattern of fifteen calendared incidents is persuasive; the same fifteen incidents reconstructed from memory under oath six months later is not.

The process,
step by step.

A modification petition is filed in the same Texas court that issued the original order. Once filed:

• The other parent is served and has 20 days plus the following Monday to file an answer.
• A discovery period runs roughly two to four months — document requests, depositions, interrogatories, subpoenas for school, medical, and employment records.
• Most Texas counties require mediation before trial in modification cases; this is usually where contested cases resolve.
• If mediation fails, the case is set for trial — testimony, cross-examination, and the judge’s ruling on best-interest.

Realistic timelines: agreed modifications finalize in one to two months; lightly contested in three to seven; fully contested with experts and evaluators can run to a year or beyond. We give a phased estimate at the consult so you can pace the work to the budget rather than commit to the worst case up front.

Defending against
a modification.

If your ex filed and you have been served, the calendar matters first. The answer is due by 10 a.m. on the first Monday after twenty days from the date you were served. Filing an answer does not concede anything — it preserves your right to be heard. Doing nothing risks a default judgment against you.

The defense substance generally lives in three places: challenging whether the claimed changes are actually material and substantial under § 156.101; demonstrating that the child is currently thriving and that stability serves their best interest; presenting affirmative evidence about your own involvement in the child’s life that is hard for the other side to contradict.

We have defended modifications where the merits favored the defense and where they favored the petitioner; the better outcome usually comes from working the actual evidence rather than running the case on positioning.

If the case crosses
state lines.

The Uniform Child Custody Jurisdiction and Enforcement Act, codified at TFC Chapter 152, governs which state has jurisdiction over a custody modification when parents live in different states. The general rule: the state that issued the original order keeps “continuing exclusive jurisdiction” as long as the child and at least one parent still live there.

Once the child and both parents have all left Texas, Texas loses jurisdiction and the new home state takes over. Filing in the wrong state delays everything by months and can give the other side a procedural win without addressing the merits. We sort which court hears what before anything goes on a docket. If the case belongs elsewhere, we say so.