U.S resident presently living in Thailand, with his two natural youngsters younger than 18, arranging a move back to the U.S ahead of schedule one year from now. Issue is he never lived in the U.S for over 5 years, anyway his mom did. If it's not too much trouble, help for something good, generally convenient, practical approach to get him and his youngsters stateside. Much appreciated!
answer
You must apply for a passport