The kids who are 5-11 pack up and run free together at family gatherings. The older ones do watch out and guide the younger. These are well behaved kids who won't do anything to fellow passengers.
I'm trying to estimate how okay it would be to let them have a kind of free run onboard the ship (or to watch movies as a group in a cabin for example). I tend to be way, way conservative on safety things, so my initial reaction would be "not at all" but since I know this is what they will be inclined to do, trying to figure from you experienced cruisers how okay/not okay running free is onboard would be.
Signed, Stick in the mud