There is a requirement from the US Department of State that parents have to fill a consent form called DS-3053 to get a passport for their child who is a minor. Parents also need to have a witness who signs on the consent form. This form also needs to be notarized. This consent form is available on internet in the PDF form. It is used when parents do not have sole legal custody of the child and both of them cannot present their application in person to the passport acceptance agent. Get DS-3053 FILLABLE PDF from here to fill up this form.