Don’t listen to anyone here who implies you have to have Club tickets to enjoy the Club and its AC. They mean well, but it’s just not true, and I think all of us Club members will tell you that.
But seriously, as far kids that young go, I would actually limit it to the night games and sit as close to the field as you can get. As they get a little older, and you can trust them, they can usually find their way to a front row seat not being used (of course still close by and within sight).
Back when the Junior Bulls Club included free admission to the games for kids, it was great seeing our kids go from being held in our seats to start exploring the stadium on their own with their siblings and friends.