I was in a situation like this two nights ago, where a neighboring family came over with their kids (ranging 10 to 16 years old, I think). Whenever something like this happens, I basically become the "host" of the non-adults. I've been in the position loads of times, and I think these three in particular might be introverts. I instinctively ask what they want to do, and one of them usually responds, "Whatever you want to do." This is troubling because not only do I want to follow someone else's lead, but I also consider that my duty as a host is to see to the specific interests of the guests.
In fact, it's a little bit frustrating.
I expect interactions between two introverts will tend to be boring or quick to die, unless it's between two Activators.