DH suggested I ask you lovely ladies for advice 
. And yes, I know it's not even Halloween yet...
I have a DD, who is two. We are coming up to her first Christmas where she might have a vague idea of what is going on and could understand a little about the various customs. I'm not religious, so Christmas for me is just a mid-winter feast/party/bit of time off work that I can spend with my DH/DD. The problem I have is what to do about St Nick. I can't decide if I should tell her he is real (and have to disabuse her later/risk having her spot that mummy lied) or perhaps take a different approach (in which case what approach?).
In part, I wonder if Terry Pratchett has it right and you have to tell children the small lies (tooth fairy, Santa) in order that they can later wrap their minds around the big 'lies' we use in society in order to be society (truth, justice,...). On the other hand, it just feels really wrong to me.