One of our two kids may be just pretending to believe in Santa Claus this year. It's okay. He's 10. One of these days we may have to tell him what's up. We have never made a big deal about Santa, beyond the standard traditions of sending a wish list letter and leaving out milk and cookies on Christmas Eve. But I've always worried about the day he asks questions for real and I have to give him for-real answers. So whenever my kids ask me if I believe in Santa Claus, I say I believe in everything Santa stands for, all that he means: generosity, care for everyone, magic, excitement, and love. I tell them that believing in Santa is not just for little kids but for anyone who feels these things during the Christmas season. I never really swear by all the fairy tale details, but I say instead that I've never actually seen Santa Claus in person. These are the things my mom said to me, and eventually I got it. I don't remember feeling betrayed or fooled; I felt...