the alanons who meet in our building have a sign on their door-
we welcome children,but we have a PG meeting,parental guidancemandatory
I know of a meeting with a big sign on the wall,we love you and your children,but they are your responsibility to keep quite during the meetings so the meeting will not be disrupted.Feel free to carry them outside if they won`t be still or quiet.
Mt wife and I carried our son and daughter to meetings all their life,and we kept them in their seat and quiet or my wife would take them out of the room.After a while,they learned what they had to do.
It is the parents responsibility to keep them quite and in their seat.It is a hard thing to do at first if the kids have had no discipline,but if the parent continues on,the kids will learn to behave.At least ours did.