My fiance's parents are throwing an engagement party for us in their backyard this summer, and we're limiting the guest list to family only. We both have some adult cousins with children, and we'd like to invite their whole families to the party, since there's a pool in the backyard and we'll be BBQing, but we're planning to have an adults-only wedding and reception. Is it rude to include children in the engagement party when we're not planning to include them in the wedding? All parents of children in question will be invited to the wedding.