Matthew apparently volunteered to be a bus guard. He's as pleased as punch over his new jacket and gleefully informed me that he gets "paid" on Fridays with candy. Sign of maturity - the candy information was secretly communicated out of earshot of his siblings, because he didn't want them to be jealous.
I asked Matthew what a bus guard does (since Elizabeth never did such a thing) and he isn't entirely sure as he has not yet received all the training. So far: Bus guards help straighten the lines and keep order on the bus, apparently.