We are looking to have an all adult wedding and reception, with the exception of our two nieces and nephew who will be 3 and almost 5 at the time of the wedding. They will be the flower girls and ring bearer in the ceremony. It's important to us to have a lot of family involvement in the ceremony, and they are the only children in our immediate families.
With that said, I do have cousins with kids and our friends have kids. I've been to so many weddings where there are kids running around the dance floor during the special dances (first, mother/son, father/daughter, etc), and parents overall don't keep a good eye on them. I hate to sound mean, but we are looking to avoid that kind of situation.
I've already been made to feel kind of badly about not allowing kids other than the 3 immediately related to us, who will likely be picked up after dinner. Have you made a decision like this, and what's the best way to let people know?