You're both a little early; "Merry Christmas" comes on the 25th.
Tomorrow, you may wish people "Merry Christmas Eve."
And today, it is appropriate to say, "Merry Christmas Adam," since we all know Adam came before Eve.
All in all, I prefer to say what I relate to you next:
Happy Christmas to all, and to all a good night!"
And here's hoping that none of you has to tear open the shutters to throw up the sash.