My Guild hasn't had much of an issue so far. Some members bring their grandchildren on meeting nights to show projects they are working on, and there is lots of encouragement shown. The youngest has been about 8. Some of us have donated fabrics and scraps they need. One girl has brought a friend a time or two. On sit and sew type days the youngsters have come to iron, press, and sew and they love helping out wherever needed. A new member recently brought her infant who was as good as gold to a meeting when a sitter didn't show and there was much more adoring than disapproval. So- I think rules which include the 'interest in sewing' and 'disruptive' concepts are the best way to go.