A: The problem with barring Lionel from the wedding isn't whether you'll hurt his feelings, but whether you'll hurt those of his parents. If you think that excluding him would cause a family rupture, you have a couple of options. First, you could consider a tiny wedding—in a faraway location, perhaps—that excludes uncles, aunts and cousins. Too radical? Then think about an adults-only affair—if nobody else under 18 is invited, Lionel's parents won't feel bad. But if you want a large wedding with every relative under the sun, you may have to try reverse psychology: Make Lionel such an important part of the day (a junior usher, for example), that he'll care too much about its success to pull any pranks. If you decide on the last option, let Lionel know that you'll be carrying his naked baby pictures with you in case he acts up.