Scary. It makes me worried in a few years when I send my kids to school. It seems today that instead of fist fights etc, it just goes straight to killing for some of these kids.
As for the parents, I'm going to withhold judgement. Just from reading the article, and nothing else, it seems that there is not a lot of supervision especially if the older brother had a firearm and was still a juvenile. But parents can't 100% know everything that is going on in their kids life, no matter how hard they try.
But w/o knowing more, I have no idea with this situation.