... Nothing to do with me, I know
But I'm judgey 
I have two friends - they are late 20s and have been together about 4 years.
They have spent every Christmas apart, because neither of them want to be away from their family on the day. So they go their separate ways on about the 23rd and see each other again on the 26th/27th.
Like I say, SFA to do with me, but I find it curious.
AIBU to think they're... odd?