Who is Youth Group from Canyons and what is their importance?

Bill is a youth group leader. When Bill invites Brennan and his mother to go camping, it is a trip that is arranged with the youth group. The youth group consists of a group of pre-teen boys who are rowdy and violent. Brennan finds himself forced to keep the kids entertained so that they will not injure one another during the trip. Brennan is annoyed by these kids and feels that Bill is too lenient with them. It is because of these kids that Brennan decides to sleep a distance from the campfire, leading him to find the skull of Coyote Runs.