SIL lied and caused an argument

[user25269800]

I have spent a week visiting my brother, SIL and 3 nieces. I stayed in a hotel and met up all week with my brother and nieces as SIL was working.
Yesterday we decided to spend a bit of time in town shopping, I wanted to treat my nieces to a gift each.
On the way to town we needed to go to SIL office as she had forgotten her lunch, so my nieces and me went to take her lunch whilst my brother went to Asda quickly to buy some drinks. Stopped for a quick chat with SIL and off we went.
So we walk back to meet up with brother, when we meet him he starts shouting at me and he's angry because SIL has said I had said something (I don't want to say as it would be outing). I was so shocked because it was untrue and upset by how angry he was.
I said to him I don't understand what you're talking about I didn't say that and my niece said the same. I ended up getting really upset and crying (and I never cry).
I walked away from my brother and nieces and decided to not go shopping and give my brother some space as things felt awkward.
I still feel so down about it and guilty for not taking my nieces shopping. I only see them twice a year and I can't forgive SIL for ruining my time with them.

why did she say what she said? Unless we kind of know what it is hard to make a judgment? I guess you say to your brother I didn’t say this; I’m not lying. I’ll go home now.

The thread is pointless unless we know what she's claiming you said.

Did she straight-up lie to ruin your time with your brother and nieces? Or could this be a misunderstanding?

What happened after your neice backed you up? Did your brother retract his accusation? Just ignore his DD, and continue shouting? If the former then I think it was a bit uncessary to walk off (for the children's sakes) if the latter, I'm not sure what else you could do. I feel sorry for your neices as their parents sound very dramatic and reactive. I hope you'll be able to treat them in another way.

without the context it really is difficult to advise and offer support.

Could it be a case of crossed wires? 'oh! you've cut your hair' has turned into 'eurgh! you cut your hair?!'. It was all in the delivery?

I think leaving was the right thing, no point in letting him rant and rave infront of the kids, especially if you're crying. Has he reached out to you since?

As everyone has said, we need context.

Do you usually get on well with SIL?

It seems quite bizarre that she'd randomly make up a lie. Could it be that she misheard something you said?