3. Bring a tradition of your own to share.
When in Rome, do as the Romans do, they say. Well, Mr. Improbable and I are in a big ancient Rome kick at the moment, and one thing the Romans did was to trade customs and household gods like mad. It's one of the reasons their empire lasted so long. So don't just be a meek little conformist--really do like the Romans do, and share one of your own holiday traditions. Bring your recipe for latkes or your DVD of "It's a Wonderful Life" and welcome your sweetheart's family into your world.