Joint legal custody in Missouri does not end when a decree is signed. This means that both parents have an ongoing legal responsibility to work together on decisions regarding their child’s education, medical care and activities, for as long as the child is a minor. If one parent enrols a child in a new school or agrees to a medical procedure without consulting the other parent, this is not a grey area. It violates Missouri law’s definition of joint legal custody.
What Joint Legal Custody Actually Requires
Under Missouri’s custody statute, joint legal custody means parents share decision-making rights, responsibilities, and authority over their child’s health, education, and welfare. Unless the judge assigns specific decisions to one parent, both parents must confer with each other before acting. “Confer” means more than just a courtesy text sent five minutes before an appointment; it means genuine input exchanged early enough for the other parent to actually weigh in on the matter.
That duty covers more ground than people expect. School enrollment and transfers, elective surgery, orthodontics, and psychiatric medications. Travel outside the state for competitive sports, whether a teenager gets a driver’s permit early, none of these fall on whichever parent gets there first.
Your Parenting Plan Should Already Have an Answer
Every Missouri custody case requires a written parenting plan that spells out who decides what and how disagreements are resolved before any filing in court. Some plans give one parent the tie-breaking power over medical decisions, and the other parent has the tiebreaker for school choice.
Other plans require mediation before either parent can act independently. If your plan does not say what happens when you and your co-parent reach an impasse, this gap is often the first thing to fix, not the dispute itself.
When One Parent Won’t Wait
A parent who repeatedly makes decisions alone and then presents them as done deals to the other is not exercising joint legal custody. The courts have taken notice of this. In July 2025, the Missouri appeals court weighed in on a case where the five-year-old’s school district was entirely dependent on which parent’s address was controlled for educational purposes. This is a reminder of how quickly a disagreement about education can turn into full-fledged custody litigation.
A single unilateral decision usually isn’t enough to change custody on its own. The pattern is different. Missouri law allows a judge to modify custody when a real change in circumstances has occurred since the last order, and the modification serves the child’s best interests. Consistent cutting of the other parent from school and medical decisions can be exactly that kind of change.
What You Can Actually Do
Depending on the urgency of the decision, there are a few options:
- First, consider going back to the dispute resolution clause in your parenting plan. Courts expect you to have attempted this approach.
- If it’s a medical decision that cannot wait for mediation, you can file an emergency motion with the court requesting them to step in quickly.
- If unilateral decisions are becoming the norm rather than the exception, you may want to file a motion to modify legal custody and bring the issue before a judge.
- In some Missouri circuits, such as St. Louis County, a parenting coordinator can be appointed by local rules if both parents agree. However, there is still no statewide law on parenting coordinators, although lawmakers have attempted to pass one multiple times.
None of these fix the relationship. They fix the decision that is stuck.
Get the Decision-Making Framework Right the First Time
Most of these disputes trace back to a parenting plan that was too vague to survive real disagreements. At Wegmann Law Firm, we have spent more than 50 years helping Missouri parents write parenting plans that stand up under real pressure. We also help enforce those already in place when a co-parent stops cooperating. If your co-parent is making decisions about your child’s school, medical care, or activities without your consent, don’t wait until the next time. Contact us today to discuss what your parenting plan allows and what to do next.
