I've been reading your posts-- I'll have to reread after coffee before I offer suggestions, but just so you know ...
the children's passports will only be good for 5 years. they aren't good for 10 yrs until after you turn 18 or 21 (can't remember which). My kids have passports (and have had since they were 2)and we are in the process of getting them new ones since theirs expired again and we're taking another overseas trip this year.
My question would be, why spend the money on a passport if there are no plans for a trip????