"Do You Hear What I Hear" is not a particular favorite of mine but it was my Mom's so here it is. I just realized I have no idea what my Dad's favorite Christmas song was, if one existed. Probably he didn't like any of them much.
I think her favorite version was Perry Como's but the youtube on that one didn't sound so good, so here is Bing - close enough:
And here is a more recent rendering by Third Day