But Douglas, do under 13's have IDs? And anyway, that won't help with the concerns you might have with the poor ratio adult-child.
I certainly want more adults than children for hopefully adequate supervision. at least 50-50.
Tighten up the rules for who can IB for next time. I would be extremely reluctant to cancel (I wouldn't, but I wouldn't ne happy either, much like your feelings). Only recommended guests can IB, and add extra conditions if you like. For mine, you can't IB if you are a group as the beds are differently priced. Nor can you IB with children outside my set ages.