It's not clear to me on the website... the tickets say for 12+ only and say kids must be over 6 to ride/join. So does that mean my 7 and 9 year old would be free to join along with the purchase of 1 adult ticket?
Highly, highly doubt it. That's never how the tours have worked in the past and, especially since there's a meal component here, there's no way they'd let kids along for free.