Invitation Wording- No children please

It is an etiquette faux pas to add the words, "No children please" or "Adults only please" to a wedding invitation. Technically, anyone not listed on the envelope is not invited and so, unless you list the children, the invitee should not bring them. 

However. Some room must be given to culture. We as LDS people tend to include and invite children very often. People generally assume the whole family is invited unless otherwise stated. So what do you do? Do you breech etiquette and let your guests know that children are not invited on the invitation? Or do you pray the kids don't come?

I know one guest that was not informed of the "adults only"-ness of a reception, and so went along with her 8 children in tow. When she arrived at the event, she was met by a hired babysitter (who was a teenager she didn't know) who informed the guest, that she would care for the children while the guest attended the reception. Well the guest had 8 kids! Including infant twins. How excited do you think she was about this arrangement? It would have been way better to alert her before the reception, so she could decide what to do with her children and have them cared for under her own conditions. 

It's worth the slight breech in etiquette to inform parents to leave the little ones at home to accommodate for our family friendly LDS culture. While this may be a breech of etiquette, the purpose of etiquette is not to blindly follow advice passed down by our mothers. The purpose is to ensure that human interactions proceed as smoothly as possible without hurt feelings. If you know someone will probably bring their children unless told otherwise and you don't want them to, then you should let the know. You shouldn't just blindside them at the event. How is that polite? Etiquette is about polite. Believe me it will make the whole experience less stressful and more joyful.