Well as an E-4 over 3, married with dependents allowance, he'll be bringing in around $40,000 a year without factoring separation pay or any specialty pay or any bonuses he may get for re-enlisting. That's not bad for someone in their early 20's.
I've no doubt he'd like a raise. Join the club.
Are you serious? I had no idea he would be pulling in that much. Shoot. I loaned him some money to buy a car last year. He better pay me back.