SIL (who I will call J) accused me of double booking an event, when it was her mum (who I will call M) who double booked. I booked a weekend away with my bestie and M kindly said she would look after my son (who I will call A). Then a week later, J asked M if they could have a mother/daughter day on the same date as my weekend away. M agreed and had forgotten she was already busy.
When it got closer to the date, M realised that she'd double booked and apologised to me. I organised other childcare so she could have the day with her daughter and we moved on - because it wasn't a big deal.
J then made a mountain out of a molehill and accused me of spending every weekend with M. I asked M when was the last time A stopped over and she said a month ago. So not every weekend.
Long story short, J ended up calling me names including "naiive, ignorant and a b!tch" and accused me of stealing all of her mum's time. I did not dignify that with a response. A few days later when I had calmed down, I wrote a long message to her to explain why she had been so wrong (there was a lot more to it but this is already a loooong post) and I'm going to leave it now because I have got 2 boys under 5 years old - I really haven't got the time for her to act like a child as well. (My eldest, A, has ADHD and my youngest is a baby, so that's a handful in itself, without having to deal with her self-made tantrums!)
I don't really have a question, I just wanted to rant. Also, to put it into perspective, J and I are both in our mid 30s. You know that film 13 going on 30? Yeah, that... in reverse! Haha!