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.Form of payment: Credit or Debit Card. Our form wizard will help you and your family know what passport form(s) to use. This form is strongly recommended if a child is traveling alone, with only one parent, or with an authorized adult. You'll need to fill out an unaccompanied minor form and any necessary Customs and Immigration documents for the day of departure. Each parent must complete a Consent for Temporary Custody and Waiver. This form is strongly recommended if a child is traveling alone, with only one parent, or with an authorized adult. Our form wizard will help you and your family know what passport form(s) to use. Generally, a divorced mother must generally obtain written permission from the child's father before taking the child out of the country.