in her defence ... it is a funny thread.
I'm going to add mine. It starts circa. August (yes, August) when SIL1 decides to start planning her xmas so she can get all the invites in early. DM, despite continually (as soon as the first xmas carol is played in the shops) saying that she categorically does not celebrate xmas, starts harassing me to go to SIL1's house, as it means so much to her. SIL1 will then start asking SIL2 to come around, SIL2 will then, as per every year, say they'll be at SIL2's parents house. SIL1 will then start getting all huffy about how "DB2 never gets to see his family" 
, and plans a three day extravaganzas so that everyone can join in. I continue to quietly say "no, I don't celebrate xmas, I'm staying at my home where it's nice". DM will say "oh come on, one last time. I don't celebrate xmas either".
By this point, I've given up and realised existence is futile, so begrudgingly agree to go. SIL1 then starts sending out emails saying:
- we're only spending 50p on presents as we're so skint, but we're happy to receive presents and
- we're charging £20 a head for food, as we're so skint (meanwhile, the only thing i'll be able to eat is the sprouts)
This then cues muchos arguing about having to pay for the privilege of being guilted into going to someone's house to eat cold sprouts and drink gin, while DM says that we mustn't upset SIL1 (in case ...?)
Things quieten down. It is agreed that parents and I go to SIL2 on xmas eve, SIL1 on xmas day and everyone goes to SIL1's house for Boxing Day.
On the days, I get dragged all over the countryside, get to sit through either:
- long lectures on how fabulous SIL1 and DB1 are or
- how Abs is so difficult and such a loser, when are you going to have children already, how dare you wear high heels (DB threatened to take a chainsaw to my shoes one year) or how dare you sleep past 7am on a HOLIDAY you lazy so and so.
DM and DF sit in the conservatory complaining about the music/how much noise DNs make high on chocolate and about xmas saying "well, at least we don't celebrate it". I vow, once again, to never go through this torture. Last year, in the car, after repeatedly saying "this is the last freaking time people - next year I'll be on vaycay in the sun" for about 3 months, DM said "so of course you'll also be coming next year?"
Sadly fortunately I am overthrowing this miserable tradition, by having booked non-refundable tickets to fly to Rome over xmas this year, in August. Instead of the above, I will be eating my own body weight in pizza and pasta. Bliss 