Relations with my ils (esp mil) have always been somewhat tense. Any of my rl friends that know her feel she is a snob. She is also quite a "cold" person in terms of emotions. I understand she had a difficult relationship with her own mum and mil, and somehow it seems as if it is her time for payback.
There have been various issues over the years. Just one or two examples, at Christmas dh was very unwell with (real not man) flu as was dd1. Mil was furious that we couldn't visit their home and slammed the phone down in temper. On Mothers' Day she was angry that we declined to go for tea (although did offer to see her in the morning). When my dh took a card and present round she told him to get fd.
They live locally but are very houseproud and find it difficult to deal with the behaviour of their gcs, my dd1 who is 4 and their other gd who is 6. Every visit is fraught. They cringe when the children go near their (numerous) occasional tables and ornaments.
The children are expected to be seen and not heard, while mil tells us all the wonderful things she is doing for the church and shows no interest in our lives.
Today dd1 and dh's niece were playing. Quite lively tbh but not unusually so. A table got knocked very slightly, spilling a few drops of water. Fil leapt up and shouted loudly making everyone jump. Dh replied (calmly and mildly) that there was no need for the drama, all was ok. Fil kept ranting that the table had been knocked over.
I stood up and said very calmly that I felt we should leave as they quite clearly found their gc's behaviour inconvenient and stressful. Fil tried to grab me and said not to go, but kept justifying the shouting saying that it had tipped over. I asked him to take his hands off me and stop lying about what had happened.
Dh backed me up (not happy though) and left with me. Mil smirked and said "yes go, I have managed to stay calm all afternoon but you should go now" I think she has been waiting for months for a reaction from me tbh.