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.The intention of this letter is to provide consent for a minor child to travel without the company of both legal parents. The border agents want proof the child is traveling with parental consent and not being abducted. How do I fill this out? Filling out this consent letter is straightforward. If children are not travelling with both their parents, (ie: if they are travelling alone, or with another adult), this form can be used to give permission. General Instructions for filling out the Consent Letter. For the U.S. and Canada this letter should be prepared in English. How to fill out the Consent Letter for Minor to Cross U.S. Canadian Border?