MIL rang up yesterday and isn't very happy because I haven't sent SIL a thank you note. Apparently I need to send one straight away.
We live abroad and 4 months ago had a baby, so they're grandmother and auntie for the first time. MIL came to visit shortly after he was born and said that SIL wanted to visit too. They both came over a couple of weeks ago for a long weekend.
We made them welcome, fed them, housed them, took them out place each day, had meals out etc. SIL took a day off work so she could come over, which was 'very kind and thoughtful of her' and we need to thank her for giving up her time like this to spend it with us.
Have a missed something and been incredible rude to everyone else who's been to visit over the years? Or is MIL taking her adoration of her daughter a step too far?