What they will do is split the $600 between all the childred under 18. As they get older you will still get a total of $600 but it will get dispersed differently. You may eventually only have 1 under 18. When this happens they will get the whole 600. I am shocked he is only getting $1200 per month. I worked for Ford Motor for 18 ears and made roughly that amound and am getting somewhat more. He may want to look into this.