I am the youngest of my MANY cousins, while my fiance is the oldest in his family. We want to invite all of our first cousins, so having an "adult only" reception won't work because some of his cousins are young enough to be the children of my cousins. All of my cousins have multiple children (we simply can not invite 20+ children/guests). My fiance has a few first cousins (and siblings) between the ages of 9-18 who we want at our reception. How can I tastefully make sure my cousins are not offended that there are some younger people at the wedding when their children are not invited?