Dear Millicent, I’m kind of dreading the holidays, and since the season is on us there’s no escaping them. I love my family and we always have fun seeing each other and eating and drinking way too much, and reunions would be great were it not for one thing. My sister-in-law, who I otherwise see eye-to-eye with and even really like, insists on seating adults and kids at separate tables. To me these seating arrangements smack of an era when kids were seen and not heard and I want my children …