
Quoting
gator1
While UCCJEA in itself is not enforceable in another country, a US court order which exercises jurisdiction over custody of a child who is a US citizen MAY be enforceable in that country.
Problem here is Florida's initial jurisdiction over a child custody Order that is now almost five years old was never challenged. And we do not know to what extent a court of another country will invoke jurisdiction over a child who is a US citizen, or how moms citizenship may affect this, or what that country's residency requirements were at the time suit was filed in Florida. So the question of jurisdiction may not be as cut and dry as if this was between states.
A proper response to the Florida petition may be to move to change jurisdiction to the child's new "home state". Aside from raising any points on who should have had original jurisdiction, in this instance Florida may very well cede jurisdiction based upon a duly raised claim of Inconvenient Forum, which certainly appears to be the case here.