When I was a kid at Christmas at my Grandparents, my grandfather would play this song on the accordion (button style - I could NEVER figure out that instrument) and my grandmother and mother would sing it ... I am not ashamed to say that when I found this on youtube I got chills and tears in my eyes listening to it ...
http://www.youtube.com/watch?v=kAufwdN7m2k

Wishing you all a Blessed Christmas ...

t.