A consent letter demonstrates that a child has permission to travel outside Canada from every parent or guardian who is not accompanying them on the trip. There is no Canadian legal requirement for children to carry a consent letter.To write a Child Travel Consent Letter for visiting Canada, you need to include the full name, date of birth and passport information of the child. A Child Travel Consent Form is required where a minor child under the age of 18 is traveling internationally without both parents present. The border agents want proof the child is traveling with parental consent and not being abducted. While a travel consent letter is not legally required, the Government of Canada strongly recommends drafting one up. How to fill out the Consent Letter for Minor to Cross U.S. Canadian Border? Both parents need to complete and sign their respective sections as well.