Is he legal?

my friend was stationed in germany (army)he found his wife there they hade there son in germany they came to the states and got maried hade a lil girl here she doesnd have a green card and he is not in the army any more is there lil boy a legal citizan?and how can they get her greencard fast they dont have much money and helphe just got back from a tour in iraq and kuwait he is in the ng.