To have kept quiet about not being invited to a siblings party?

[FeFe66]

In my 50's so I should be over this but I'm human.

Anyway it's my siblings birthday. The whole family meet up at a country pub for a drink at lunch time.

Because of COVID and they live away, it's the first time I've seen them since Xmas 2019.

I give them their birthday present which cost £150 and I know that they wanted. I can ill afford that sort of money at the mo but was happy to get a present that they wanted and I get an "oh that's nice, but no thank you".

I buy the first round. Then as everyone finishes the one round, my sibling says we're off to their daughter's for canapes.

Everyone says oh that's nice. I have just taken the last sip of my drink and before I can answer, my mother says "are you coming FeFe?" and before I can answer my sibling says "oh FeFe's got things to do this afternoon" effectively uninviting me after taking my gift and drink.

The mother keeps on, "oh shame you can't make it".

I felt like saying that I can make it but have just been un-invited but bit my tongue. I wish I hadn't. Should I tell her so she knows what my sibling is like?

AIBU

Calling it a squabble is minimising horrible behaviour

That sounds horrible. Sorry for you op .
I think your sister owes you an explanation .
But families can be a pain . Just stop the presents and treat yourself .

This is so inexplicable. No insights at all, no previous history? There must be a reason for sibling to do this?

I'd hate it if my DC were treating each other like this and I'd want to know.
Absolutely Tell your mum... why on earth should you have to cover up your siblings crappy behaviour and let your mum think you can't be bothered to come to a family event? Maybe she might have some insight into the situation and might be able to help you.

Don't just sit there feeling hurt and puzzled. If sibling is willing to lie in public about why you couldn't come to the party and you sit there and say nothing, who knows what other lies she's told about you?
Speak up for yourself calmly and politely, message sibling and ask why she said that and that it wasn't true and what is the real reason she didn't want you there? Get an answer instead of making up worse ones in your head and upsetting yourself.

The truth is important. Its also the first step for you in being more assertive.

OK so it may seem like making a fuss but based on what you've just described it sounds like about time.
And stop people pleasing people who don't treat you well by rushing to buy everyone a drink and lavish presents you can't afford that you don't even get a thankyou for. Is this something you do regularly? How often does it work?
The sibling does'nt seem to be a positive influence on your life. Please see if you can find someone to talk to about this.

I'm sorry but there must be a huge back story to this.

Unless you don't generally get on with your sibling.
I would have just said sibling was mistaken. I'm not sure why that would have caused a scene unless there is a huge back story

I think it was nasty of her. Lockdown has had a weird effect on some people.