The general rule for suing minors for negligence here in the US of A is that, if a minor is engaged in an activity that requires an "adult"-level standard of care, then that minor can be held responsible for his negligent actions just as an adult can. Usually those "adult-level" activities include things like driving a motor vehicle, though. I doubt skiing would qualify, but you never know.
Either way, the guy definitely has a claim against the parents for negligence. Whether or not he'll succeed depends upon issues of fact: whether the kid was operating at reckless levels of speed without regard for the safety of his fellow skiers, and whether or not his parents were watching out for him.
"'Casual games' are something the 'Game Industry' invented to explain away the Wii success instead of actually listening or looking at what Nintendo did. There is no 'casual strategy' from Nintendo. 'Accessible strategy', yes, but ‘casual gamers’ is just the 'Game Industry''s polite way of saying what they feel: 'retarded gamers'."
-Sean Malstrom
