I am having a similar dillema. I have invited some people who I know will want to bring their kids, but I would really prefer a kid free reception. I think you have to set your own rule... like family only. I'm not including "and family" on the invitations and have mentioned to several people that the only kids I'm expecting are the flowergirl and the kids of our out-of-town groomsmen. I also figure if someone really wants to be part of my day, they will find a babysitter.