What must I write in a child's travel consent form? 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.This letter ensures the legitimacy of the accompanying parent's legal right to travel with the child. 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 Child Travel Consent is required to cover all bases and legally allow a minor to travel with one of the parents or with a third party. Additional forms may be found at the Superior Court's Law Library Resource Center website. We recommend a signed and notarized consent letter from the child's parent or parents, such as our Child Travel Consent Form.