Well in my area I have seen kids from less then a month old all the way up to 15 come with a parent to meetings, with the older kids they usually bring home work or a video game are are content sitting in the kitchen, with the really young ones it varies, if the parent has pretty solid sobriety they go into the hall or outside if the kid gets cranky or if the parent with the child is a newcomer I have seen more then one Old timer walking the halls with a crying baby to where the parent could get the time in a meeting they need.
I have not expereinced any kids disrupting a meeting, maybe I am just lucky. I have no problem with kids at a meeting, if a parent needs a meetinig I can practice my love and tolerance.