Love Story (1970)
By my reasoning, adjusted for inflation Love Story is the second highest grossing Christmas movie in history in the US and Canada , with only A Hundred and One Dalmatians beating it out (though it's not particularly close). I should also add I'm not counting a couple movies with ambiguous holiday credentials in that ranking: if you're of the opinion Ben-Hur and/or The Sound of Music are Christmas movies, you'll want to push this back two or three spots respectively (hell, Sound of Music would take the top spot). Either way, Love Story beats out Home Alone, if you want a sense of just how successful this was back in 1971 (it opened in New York in December of 1970, but didn't get a wide opening until June the following year). I blame Wikipedia's list of Christmas movies for the fact this one slipped under my radar as long as it did - it's on there but for whatever reason it's currently separated into a category containing only itself. That's absurd, b...