Stevie Wonder's Everyone's A Kid At Christmas Time is pretty good or Sammy Davis Jr's version of Jingle Bells is pretty funky (for an Xmas track, of course).

And, of course, anything from Phil Spector's Xmas album is darned great.

Thoughtful, soulful and def. no cheese.

unless you come the hippest family this side of Pesos I think your stuffed from my experience as in such a broad age range you'll never find something to fit. i found that even though 70% of my extended family have no great interest in music (and appalling taste) for most of the time there was no one tune they all like at christmas. Indie Christmas songs being dismissed as depressing, classical music being switched off as the throng are wanting something more update etc.. I think you may have to plump for the hubbub of merry conversation, the tingle of glasses and the clatter of cutlery and the distant sound of the eastender's theme playing for the 9th time that day.

Low - Just Like Christmas
James Brown - Santa Claus Go Straight To The Ghetto
Saint Etienne - I Was Born On Christmas Day
Otis Reading: Merry Christmas Baby
Badly Drawn Boy: Donna & Blitzen
Elvis: Blue Christmas
Johnny Cash: I Heard The Bells on Christmas Day
The Waitresses: Christmas Wrapping ( AKA The Best Christmas Song Ever)

Dido
Sigor Ros
Leonard Cohen

http://www.wordmagazine.co.uk/content/phantom-hits#comment-5340

Ed Harcourt - In The Bleak Midwinter
Eels - Everythings Gonna Be Cool This Christmas
Noel Gallagher - Merry Christmas Everyone
Flaming Lips - A Change At Christmas (Say It Isn't So)
Rufus Wainwright - Spotlight On Christmas

Also, though it pains me to admit it, I think Mariah Carey's All I Want For Christmas Is You is one of the few decent modern attempts at a big Christmas 70s pop song.