Is NOBODY wrong in the post ? POST : Sorry for formatting, on mobile yada yada yada.

So it's the 23rd of December and my mum has just spent the entire day slaving over the oven, creating a vegan nut roast for me, my 8 year old pescatarian brother and my vegan cousin. Which many would consider a pretty tough challenge. My entire family has spent weeks preparing for a vegan cousin at Christmas and what to feed her, scouring through recipe books and surfing the net for the best recipes.

So the day is up; nut roast is made; vegan gravy chilling in the fridge and we get a call on the home phone so my mum goes to pick it up.
"yes...uhuh... So what's the plan then.. Oh really... Hmm okay... Alright see you then"

So I ask her what the matter is, and it turns out that my uncle (who is coming over for Christmas eve, Christmas day and boxing day) has failed to explain to my mum that his daughter is not going to be eating at our house on Christmas day.

So we all had a couple of drinks and are pretty livid about the whole situation and decided to ask whether or not we would be the asshole of we were to have a go at my uncle for not telling us, after the hard work we put in?

TL;DR uncle doesn't tell mum about vegan cousin not coming for Christmas Dinner after spending the day preparing a meal so is planning to have a go at the uncle. 