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 parent can sign an "authorization agreement" form to give a nonparent the authority to care for and make decisions for a child. Ensure safe travels for your child with our free travel consent form template and expert guide. Get consent from both parents and travel with confidence. According to the USA. Gov website, if a child is traveling abroad with one parent, the other parent must supply a notarized letter granting permission. This guide includes forms and instructions for a letter and affidavit to request that the court register an outofstate custody order in Texas. Passports for applicants age 15 or younger are valid for five years. A child travel consent form allows a minor to travel alone or with another person or group.