
Quoting
Mr. Knowitall
So by "parenting plan", you mean some sort of informal agreement between the parents.... is it even in writing?
If we're simply talking about an informal agreement, and there's no court order that would prevent a parent from deciding that the agreement was no longer suitable, then the parent can indicate that they no longer going to abide by that provision of the prior agreement.
If the concern here is international kidnapping, or that one parent may try to relocate with the children to another state, then the parent concerned about removal should go to court. Otherwise, what's the problem with an out-of-state trip?