If your child is under the age of majority, a Letter of Consent should be obtained from your child’s other parent any time you plan to travel outside of Canada. This applies to either parent, or if your child is traveling with another family member or a group.
Usually, the custodial parent or guardian signs Letters of Consent. However, in some instances, it can be prudent to have a parent with access rights to sign a Letter of Consent. While the Government of Canada does not technically require a Letter of Consent, it shows that both parents have consented to the child’s travel, and it will likely make your traveling experience smoother.