[quote LittleDandelionClock]@DappyApple
I decided to switch it out one year and did buffet Christmas Day and dinner on Boxing Day instead of the other way round.
Which was just as well as we had unexpected guests turn up at 9 am (we had only been up since 8.30 and not dressed!) and proceeded to stay for the whole day. We had no idea they were coming but it turns out they were expecting a full sit down Christmas dinner. (Despite me asking what their dinner plans were when they arrived, they said they were going to her parents!)
Sod that. I would have said 'we are off out in an hour to the beach., so you can't come in...' Like fuck would I have let a bunch of unexpected cheeky fuckers 'guests' in on Christmas morning!. Who the fuck just turns up at someone else's house on Christmas morning, stays for the whole DAY, and expects to be waited on like they are Royalty? 
Nope. Would never happen in our house.
Who were these people anyway? Friends, acquaintances, family? Who? Like I said, what kind of arsehole just turns up at someone's house at 9am on Christmas morning, and expects to stay the whole day?
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Bil + Sil Apparently!
Although I was mightily pissed off at the time, we didn’t actually say anything on the day as they were young & naive at the time (19-20) and they’d just had a baby, (baby was about 6 weeks old!)He has had to basically fend for himself since the age of 16/17 due to loss of both parents! So we did give him a bit of leeway.
Dh did have words with him for the following year though, after bil mentioned he was gutted that we “didn’t have a Christmas dinner last year!”
He stated that if they wanted to come, he needed to ok with us first and can’t just turn up unannounced with no warning. Also if he arrived at 9 am he’d be sent away to come back at an appropriate time!
I just think they didn’t think things through/along with baby brain and honestly didn’t think that they were being cf. I often wonder what an earth their train of thought was at the time!
But if it was anyone other than bil we’d have told them to jog on.