I remember I read something about this somewhere. Mugglenet? I checked and found it on Mugglenet. It's in a section titled "The Little Things" under "Books". It's general facts that JK has let out that aren't in the books- pretty interesting.
But here's what it said pertaining to this:
-The Hogwarts teachers do not stay at Hogwarts during the Christmas holidays. However, Filch, Hagrid, and Dumbledore do.
But others do..... Maybe during summer the teachers don't stay, but some at Christmas?
-A few of the Hogwarts professors have spouses, but that information is restricted for reasons we will find out about later.
Did we ever find out about these reasons? Or am I just delerious and not remembering?
I don't know the last time that list was updated, so maybe there's more known that just isn't written there. But I suggest reading it- some I already knew, but interesting all the same.