Then why does customs required our daughter-in-law have a notarized letter from our son? Just because they have a passport it does not mean permission by both parents was given. It kids one parent from kidnapping the kids and moving out of county. It is the law. When she travels to Japan or even Canada she has to have the letter... it is checked.
My Cousin had a had time getting his son into Canada, she wife is dead. They talked to the son and let them pass. He now carries a copy of the death cert. with him.
Again you should get your ducks in a row before trying to take them out of the Country!!