See what documents a child needs to travel to or from the US alone or with a parent or relative. Non-US citizen children traveling to the US.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. The intention of this letter is to provide consent for a minor child to travel without the company of both legal parents. A parent or guardian must complete this form and have it notarized no earlier than 30 days prior to departure. An order of custody gives responsibility for the care, control and maintenance of a child to one or both of the child's parents or to another party. Your parents refuse to treat you as an adult. Suppose a child (under 18) travels with only one parent or someone who is not a parent or legal guardian. I will be taking a letter of authority from the non travelling parent. 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.