Fortunatly Nyxie, there are alot of things about Christmas that remain unchanged from its Pagan roots! For instance Santa, or should I say the Holy King...
The decorating of a tree, Yule Log, heck even gift giving! All of it comes from Pagan roots! So they can have the vast majority of the activities they are used to, but still keep it Yule. One thing that I intend to do one of these years is the full cycle of the Yule log... Basically, the way it was explained to me, beginning around Yule you choose an evergreen tree, cut it and bring it in... decorate it with gifts to honor it for its sacrifice. After Yule, you allow the tree to dry and remove all the limbs. On Beltane that tree will become your Maypole, honoring it by coating it in oils and herbs before wrapping it with ribbons in the traditional dance. Its then left to cure until the next Yule where it is cut into lengths and distributed amongst the coven as Yule logs for their home. I don't know how "traditional" this is, but I have been told of it by two friends in separate covens over in the UK, and I find it to be very intriguing... ok well now I am just rambling... sorry lol. Enjoy you new Reo(s) and try to have good Yule season.
PS. One book I would recommend especially this time of year, and I know someone will hate me for this, is Circle Round by Starhawk. A lot of VERY cool family, and often earth, centered things to do with the family/kids. I highly recommend the Wish Bread activity! It was a hit with my cousins a few years back (they are A LOT younger than me so I am almost more of an uncle figure in their eyes but ya know)