A lot of young teens are allowed to go hunting or fishing with only slightly older friends. And a blizzard in CO is not as big of a deal as one in NYC.

I am not real worried about the age of the kids. The blizzard thing is a little more of an issue, but without knowing who knew what when, and exactly what they knew, i am not incliend to blame the parents. You cannot lock a teenager up to keep them safe.

Two of them had the same last name so probably an older brother of the 13 YO.