My fiancée and I decided to NOT invite children to our wedding...we both have pretty big extended families that we are close to an in order to accommodate everyone, we had to cut the kiddos out. I have thought about adding "Adults Only Reception" to the invitation, but I have read countless commentaries about how tacky that looks and to only address the invites to "Mr and Mrs Kids Parents" rather than add "And family" (duh)...but I have another issue:
I have a lot of second cousins in my family, all in their early to mid twenties, who WILL NOT be invited to the wedding so I fear that if I have the wedding invites say "Adults Only" then these cousins of mine and their parents will just assume that the 20 something year cousins WILL be invited, over looking invitation etiquette, causing me an awkward conversation when the response cards come in. I have thought about filling in the response cards with the number of people attending, not giving the option.