During Christmas day at home when I was growing up the television was on the whole day starting with the children's programmes. The strand generally ended with a very poor festive cartoon film called something like Flossy Reindeer Saves Christmas. Where the eponymous hero learns something about the true meaning of Christmas and other moralising messages pausing only for some really bad songs. Nobody's really watching it though because its presents time!
Television at Christmas time thrives on tradition, turning over just as the Queen's speech is starting and only tuning back once its safely finished. watching The Snowman on Channel 4. Which I see is being shown again, although no longer on Christmas day. Repeats give rise to that great pre Christmas traditions the newspaper article complaining about the amount of repeats. The Daily Mail managed to excel this year by publishing the piece before the schedules had been released.
Tradition is why the Sound Of Music gets another showing, personally I'm not a fan of over saccharine type films with the possible exception of Its A Wonderful Life. The great thing about tradition is that every family's traditions are different and there's probably a new one starting this year.