My family and I are going to take a cruise this summer. We have to have passports. My step-son's Bio-Dad is incarserated, has been for 8 years and will be for a VERY long time. He has not seen or even tried to talk to my step son since he was incarserated. We do not wish to open that door and don't know where he is. To get a passport for a juivinile, both bio-parents need to sign on the dotted line. How can we do this without involving biodad?