How do I respond to someone wishing me a merry christmas?
"Auguri per un felice Natale a te e famiglia!"Edit: I now realize I didn't explain this very clearly - the Italian sentence I wrote is what I want to respond to.

Question

How do I respond to someone wishing me a merry christmas?
"Auguri per un felice Natale a te e famiglia!"Edit: I now realize I didn't explain this very clearly - the Italian sentence I wrote is what I want to respond to.

Answer

Sorry, this was supposed to be an answer, I realized later.
So it should start with 'anche' or 'anche' should be present:
- Buon Natale anche a te e {ai tuoi cari, alla tua famiglia}
(I would not drop /tua/ in /tua famiglia/)

Answer

Hi Anna
There is no a particular way of saying but as Andrew said , you can replay:
Tanti auguri or Buon natale anche a te.
There are two others motto very nice:
1 - Buone fatte feste = a wish after Christmas
2 - Buona fine e Buon principio = a wish to indicate a wonderful end of year and stunning new year.

Answer

You hit quite near the center.
1a. Auguri di un felice Natale a te e alla tua famiglia!"
1b. Auguri di un felice Natale a te e ai tuoi cari!
OR 
2a.  Auguri di Buon Natale a te ...

Note that in forms (2), which are more common, the article is not needed.
By the way: Buon natale e Felice anno Nuovo a te e ai tuoi cari.

Đừng bỏ lỡ cơ hội học ngoại ngữ ngay tại nhà. Hãy xem danh sách các gia sư ngôn ngữ giàu kinh nghiệm của chúng tôi và đăng ký buổi học đầu tiên ngay hôm nay!