I know it is still 4 months away but DP and I loooove Christmas. We made plans a month ago to invite my parents and his parents round for Christmas dinner this year. Nice quiet family time. Shortly after, we travelled to visit DP's aunt and uncle. The topic of Christmas came up and they mentioned they were at a loose end. DP and I discussed it and decided to invite the aunt and uncle for Christmas too as a thank you for letting us stay with them during our visit. So now 6 people in total. While we were visiting, their daughter (DP's cousin) came round for dinner one evening. Again, the topic of Christmas came up in conversation. She told us in no uncertain terms that wherever her parents are going for Christmas, she would be going too. Also DP's grandmother (the auntie's mother) would have to come too. DP and I didn't really commit and said we'd have a think about it.
So potentially up to 8 people now. With me so far?
Fast forward to yesterday, we got a phone call from DP's mum telling us that the auntie's other daughter has said she wants to be with her parents too so that's 9, her husband = 10 and their unruly puppy needs to come too. (I have nothing against dogs at all, I love them but they let her jump all over their furniture and chew shampoo bottles and basically wreck their house). DP's mum then went on to say that she will also ask her brother... 11 and her brother's wife... 12 to come too. Oh and the two daughters, the husband and the aunt and uncle will have to stay at our house too for 5 days because DP's mum doesn't want them all at her house. 
That was it for me. I told DP to hang up the phone because we are not committing to anything. AIBU to be absolutely fuming?? What has turned into a relatively low-key Christmas has now become a free for all with DP's mum inviting every relative she can think of (but conveniently palming them off at our house to stay). Now DP and I are completely at a loss because if we say no, everyone is going to be disappointed. However, if we say yes, DP is convinced that his brother and family are going to want to come too. (DP and his brother do not get on). His brother is due to go to the wife's family for Christmas this year as they were last year but cancelled because the whole family came to DP's mum's and the brother couldn't bare to be left out. I can't see him wanting to be left out this year either.
It's going to be a tight squeeze and I'm not even sure our tiny kitchen has the potential to cook for 17 people (including us). Is there some sort of compromise we can come to or do we just flat out say no? 
