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.Parental consent documentation for travel to Canada and Mexico. The intention of this letter is to provide consent for a minor child to travel without the company of both legal parents. It also includes guidelines and templates for parents and guardians traveling with minors. In every province and territory, children above a certain age must consent to their adoption. In most jurisdictions, the age of consent is 12. It is also best to have a letter of authorization from the other parent who has custody to take the child on a trip out of the country. Adoption legislation also provides for dispensing with a child's consent to adoption. Minor Passport Card (Not valid for international air travel.