Ok. Firstly I have to say that my MIL is a really lovely lady. She loves her sons and her grandchildren and I know that she genuinely likes us DIL's too. It's just him.
I have approx 4billion stories that make me cringe but last Xmas was particularly horrid. My SIL, her husband and two kids came down for the day. MIL and FIL had already been here for 4 long, long days. They always like going out and keeping busy but I was getting over an ear infection and just couldn't combine Xmas prep, inlaw duty and child wrangling. This resulted in my FIL getting progressively more cross. He wouldn't take the car out himself as he was 'on holiday'.
He is hard of hearing and keeps turning his hearing aid off. This means that he thinks I can't hear him moan. He kept passive/aggressively asking what we were doing today. I would give him some suggestions and he would humpf. When I left the room he would shout 'why is she hanging about? We've come to see our son, not her. What is for dinner? Christ, why can't we go out?' Really loudly.
He then acted all confused when I confronted him and asked him exactly what he wanted to do/go/eat. When I left the room he would shout 'what's wrong with her, all she's got to do is make the dinner, which will be crap as usual'. When confronted, he denied saying a word.
My MIL was in tears.
Anyway, Xmas morning my SIL arrived festooned with many gifts for FIL who opened them all with no comment. When she left the room, he shouted 'Christ, she's let 'granddaughter' get fat'. We all, including my lovely niece, heard this. Cue crying and shouting.
Happy Christmas.
All day he critiqued every.single.thing my niece ate. She is 8yo and gorgeous. My husband had to take him out of the house and explain that he was not welcome and he needed to apologise to everyone. The atmosphere was horrible. He didn't apologise and went into his bedroom where he loudly talked about how rubbish his presents were and how working mothers can't feed their kids properly. He also said that he couldn't believe that me and my dh (who are normalish and very content) weren't divorced yet.
To top it off, he has been telling the kids a rolling story for the last 9 years of a magic land and a magical boy (frankly this is his only redeeming feature) and he decided that Christmas bedtime was a good time for the magical boy to die as he was tired of the story.
Wanker.
When he gets old, he's going in a home. The cheapest one we can find. Other people think he is clever and witty. He is an utter shit IMO.