JWfacts,
My daughter is a realist; at 3 she even doubted when we explained that Santa would come down the chimney and leave gifts. But she still tiptoed out to check that Christmas morning, and one of our happiest memories is how she rushed back in to wake us, full of excitement to share.
20+ years later the kids and I still share Christmas with all the trimmings. Christmas is a special family time and chilren like your son make it magical.
Enjoy!