Karlie, my younger sister who doesn't seem so young these days, was still little and believed in Santa Claus. Although I knew the truth, I decided to make it my mission that Karlie keep believing for as long as possible. I typed her a letter every Christmas on Microsoft Word with some kind of swirly/old timey font. Of course, I could refer to very specific things in her life and she was totally amazed. Every year, she would read these letters in amazement. I was so excited. It was working!
I hope I don't totally ruin her reputation by saying that I'm pretty sure I kept her going until 7th grade. Yes, she heard other people say he wasn't real, but I mean, she was getting letters from him! So, naturally, he's real. Finally, she asked for the truth one day and she got it.
Anyway, I'm pretty proud of my strategy. As I sit here now thinking about how thrilled she was reading those letters, it makes me a little emotional. Believing in Santa was a magical thing. I hope that you all got to do it. :)