Can a court order contact time between half-siblings from different relationships?

Yes. Ontario's parenting law allows a court to order contact between a child and a non-parent where that's in the child's best interests, and a half-sibling from a different relationship can qualify for this kind of order, particularly where the two children have an existing relationship that a family breakdown or a parent's relocation risks disrupting. The application is typically brought on behalf of the older sibling, if they're an adult, or through a parent or guardian acting for a younger sibling.

As with other non-parent contact applications, the strength of the existing bond between the siblings matters a great deal - regular time spent together, a shared history, and evidence the children value the relationship all support the case, while a half-sibling relationship that never really developed is a harder starting point. A court will also consider practical matters like each family's location and schedule, and whether contact can be arranged without creating excessive conflict between the parents involved. If you're trying to preserve a half-sibling relationship after a separation, document the existing relationship and speak with a family lawyer about whether a contact application or a negotiated agreement between the parents is the better route.