Can an out-of-province parenting order be varied by an Ontario court, or must it go back to the original province?

Generally, an Ontario court is cautious about varying a parenting order made by another Canadian province's court, and will typically only do so where Ontario actually has proper jurisdiction over the child under the Children's Law Reform Act's jurisdiction rules — most commonly, where the child has become habitually resident in Ontario, or in narrower circumstances involving urgency or the child's presence and best interests. Where the child remains habitually resident in, or still has their strongest connection to, the original province, Ontario courts generally expect the variation to be sought there instead.

This approach exists to avoid competing or conflicting parenting orders between provinces and to keep decisions about a child with the court best positioned to have full information about the child's current circumstances. Where jurisdiction genuinely has shifted to Ontario — typically after the child has been living here for a meaningful period under the applicable jurisdictional rules — an Ontario court can take over the matter, including varying the existing order. Anyone in this situation should get legal advice on where jurisdiction actually lies before starting a variation application in Ontario.