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. 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 travel consent form letter is required for each traveling child. Child's Information: The form includes the child's full name, date of birth, place of birth, and passport or identification details. This form is often required when a minor child will be traveling to another state or country without both parents being present. How do I write a consent letter for my child to travel? When a minor travels with both parents, no written authorization is needed. My ex won't give travel consent form. I have the passport already.