Kids skis are cheaper because they are meant be grown out of. if you are talking about the full size Bacon's then no. He would not have a good time in them being he is waaay too light and small for them. The Bacon shorty's are made for lighter skiers with cap construction and an aspen core rather than a maple core. The tantrum's vs the tst's have a cap construction, different base material, and no carbon and Kevlar stringers. The point is kid skis are different than adult skis for a reason, and they are cheaper and meant to be grown out of.
so if he is a shredder more of a charger get the Bacon shorty's for their full twin tip
if he is a charger more than a shredder, get the tantrums for being a directional ski
and if you want to be an awesome brother and you live somewhere where there is a lot of pow, get the triple j's