Kara McNabb • October 9, 2026

Missouri Paternity Cases: What Happens When Parents Were Never Married

When do unmarried parents need to file a paternity case in Missouri?

Paternity actions are necessary when parents are not married, as there is no legal presumption of paternity like there is for married parents. If both parents' names are not on the birth certificate, a paternity case is needed to establish legal parentage and associated rights.


Does being listed on the birth certificate establish custody and parenting time?

Being listed on the birth certificate does not establish legal custody or parenting time. Without a court order, both parents have equal rights, which can lead to disputes. It's advisable to file for custody agreements when relations are amicable to avoid conflicts later.


Can either parent initiate a paternity case, or must it be the father?

Either parent can initiate a paternity case. Fathers may file if they are being denied contact, while mothers might file to seek child support. Both scenarios are common and legally permissible.


What happens if paternity is disputed by either parent?

If paternity is disputed, a court may consider third-party custody if a parent has been held out as the parent for a long period, and the child is bonded. This can occur even if a paternity test shows no biological link, highlighting complex legal scenarios.


What issues can the court address once paternity is established?

Once paternity is established, the court will address custody and support. The default assumption is that equal parenting time is in the child's best interest, but deviations can be made if one parent proves otherwise. Legal custody covers major decisions, while physical custody outlines the child's living arrangements.


Does the marital status of parents affect child support proceedings?

Child support in Missouri is calculated using form 14, which considers each parent's income, potential income, insurance, tax dependencies, and parenting time. Marital status does not directly affect the calculation, but legal agreements can deviate from the form 14 if deemed appropriate by the court.


How does previous informal parenting arrangements impact court decisions?

While informal arrangements may work temporarily, they often break down, resulting in disputes. Courts will consider recent history and parental cooperation, but informal agreements hold little legal weight if challenges arise.


Why should parents establish legal custody and parenting time if they are getting along?

Establishing legal custody provides a safety net for when relationships change, such as when new partners are introduced. It prevents disruptions in the child's life and ensures both parents' rights are protected, avoiding potential future conflicts.


What should unmarried parents prepare before starting a paternity case?

Unmarried parents should discuss plans with each other to avoid confrontations. They need to gather demographic information, case history, and have a cooperative mindset to minimize stress and costs. Legal preparation requires understanding the implications and potential outcomes of filing a case.