A number of years ago our guild wrote a provision in the by-laws that members had to be 18 plus because several members brought grandchildren to learn quilting. They paid member dues at a discounted rate during the summer months only. They were disruptive and members felt uncomfortable with them at the classes because of topics discussed and so on. The discussions were not inappropriate, just not kid friendly topics. Our classroom space is limited also. This was a membership decision, not a visit for one meeting.
Members occasionally bring a child with them, but our president is really on the ball and tells them before the meeting where they can take the child if they need to be taken out of the meeting. She is so diplomatic I doubt anyone is offended.