I guess the kid just has weak stamina or something. Nothing wrong with either the kid, or his parents. Apparently the kid can't take the LAN party lifestyle as good as some others. He didn't die, he didn't even get injured. Lesson learned and move on, knowing your newly found limits. This is more a story of growing up, then it is of epic fail.
I've passed out from exhaustion on a 3 day LAN before in the past, now I know I won't make 3 days awake, so I won't even try. I got sick/weak a few times at longer LANs, so now I watch my nutrition better.
Live and learn.