I liked it too, and this is a good point. Christmas ads, films and programming generally at Christmas lean hard on images of traditional families, all smiling and warm and bathed in firelight. That must be hard to watch for children who don't have that.
I think this is very sweet and it DID make me cry - as always. My favourite remains the one with the child counting down the days till Xmas so he could give his parents their present.
Threads about the JL Christmas ads always contain 50% moaning and complaints about the music, though. It's a festive tradition in its own right!