“Christmas” should always be capitalized ... and thus it needs to have an apostrophe just like any other contraction (e.g. “isn’t,” “can’t”, etc.). The same applies for ...

Making a family’s last name possessive rather than plural is a common faux pas on Christmas cards. You never, ever, need to include an apostrophe when it comes to naming your family as a ...

The other day I received a Christmas card addressed to "The Diorio ... your name with the incorrect plural formatting. Putting an apostrophe before the letter “s” makes the name possessive.