I think I have said in the past that I label myself as something of a reluctant worshiper. But you can not have Christmas without Christ and I also really enjoyed this time of year as a child growing up and going to Sunday school, so I make it my aim to teach the boys about Jesus, the Christmas and Advent.
Last year, the wonder Coffee Lady told me about a book called The Light in the Lantern, which is filled with short stories for advent. The stories are intended for reading aloud for children of school age and are perfect for sparking conversation about Advent. The are pretty short, but perfect for night time reading.