The usual test

Courts do not reopen settled arrangements lightly. In most states the person asking for a change has to show a substantial change in circumstances since the last order, and, where children are involved, that the change would be in their best interests. What counts as substantial is defined by state law and by how local courts have applied it.

Common examples include a significant change in either parent’s income, a job with different hours, a planned relocation, a change in a child’s medical or educational needs, or simply a schedule that no longer suits a much older child.

Why mediation fits this well

A modification is usually a narrow question rather than a full reopening of everything. That makes it well suited to a short piece of mediation: one or two sessions to agree the specific change, rather than a motion, a response and a hearing date some months away.

It also matters that you are almost certainly going to keep dealing with each other. Litigating every adjustment sets a pattern that is expensive and exhausting. Agreeing them, where you can, does not.

The step people skip

Parents frequently agree a change between themselves and never take it back to the court. For a while it works. The difficulty comes later: the order on file still says something different, and if a dispute arises, that is the document that will be enforced. Informal arrangements can also cause real problems with child support arrears, which in many states cannot be waived retrospectively.

If you agree a change that matters, have it made into an amended order. It is usually straightforward when both of you agree, and it is what makes the new arrangement enforceable.

Relocation is its own category

One parent moving a significant distance with a child is treated separately in most states, often with its own notice requirements and its own legal test. Do not assume it can be handled as a simple schedule adjustment. Take legal advice before agreeing or opposing a move.