The father brought an application under the Hague Convention for the return of the parties' two children to Adelaide, Australia.
The mother had travelled to Ontario with the children for a temporary visit but failed to return them.
The court found that the children were wrongfully retained in April 2020 and that their habitual residence immediately prior to the retention was Australia.
The court rejected the mother's argument that the 11-year-old child's views should be considered as an exception to return.
The application was granted and the children were ordered to be returned to Australia.