No, children under the age of 18 do not need to file a separate Form 1583. However, you do need to list your minor children in field 12 of your Form 1583. This field is specifically for listing the names of any minors who will be receiving mail at the private mailbox or virtual mailbox. By including your children's names on your Form 1583, you ensure that the Commercial Mail Receiving Agency (CMRA) has the proper authorization to receive and handle mail on their behalf.