I've never spent a Christmas away from my mum and dad's.
In the time DH and I have been together (5 years) Christmas has always been with my family - his family are in Australia and though we've been out to visit it hasn't been at Christmas. (Though they'd like us to).
My mother is a Christmas fanatic and goes all out for us all. Huge amounts of presents (which we can never match, and enormous generosity all round in terms of food and hospitality.)
We've always loved it, and I would never change our plans for this Christmas at this short notice. But since we had DS1 (he's 1 and a bit) I've been slightly craving a low key Christmas just the 3 of us. No one else.
I fear I am being unreasonable which is why I haven't suggested it. I'd upset my mum so much. This year I asked her if she could go a bit easy on presents as we don't have much money to reciprocate and tried to do it really gently and she still got a bit upset. Imagine if we said we weren't coming with he DGS?