DS is just 13, year 8. Broadly, he's a good kid but he's heading into the phase of being in his room, door closed, as much as possible! Luckily, he does quite a lot of sport etc so we still get time together and we chat and he's not completely invisible! 
But he's so indifferent to Christmas, which is bad enough, but I think that ironically, he feels sad about that too. He said to me the other day that he just isn't excited about it at all and it's weird because he used to love Christmas.
the problem is that he won't really eat a lot of Christmas treats - he has previously been overweight and while he's absolutely slim now, he worries (which is, in itself, an issue and concern for me and his dad). He's not really into Christmas movies or shows (although DH might have more luck at getting him to watch with him once the holidays start as DS likes to watch movies with DH late at night). Last year I took him and DD to Disney on Ice which he quite enjoyed so maybe I should find something like that - but money is a bit tight and due to work timings, it's going to be hard to find the time this year.
What can I do to get him a bit excited? I think he's probably also suffering a bit from SAD. He hates the him and his friends can't really meet up at the park, or go out as much as none of us want them walking around in the cold/dark/wet.
Any ideas of things I can do/suggest for him when he's on holiday next week to get him bit more psyched up?