Posting here for traffic -
Background - DD is almost 18 years old and I split with her father when she was 6 months old.
Despite living in the next village to ex MIL/FIL they have never taken much interest in DD and she had never been out with them on day trips, holidays or sleepovers like her cousins. They never ring her and the only time they ever saw her was I or DD's father took her to their house. For these reasons she has never been particularly close to them.
DD has (over the last few years) been having some MH issues and social anxiety meaning that she finds it difficult to be in many social situations especially with people that she doesn't know or feel comfortable around.
Ex FIL sadly passed away last March and DD decided not to go to the funeral. For perspective my DB, whom DD was very close to passed away 2 years ago. She also decided not to attend his funeral. This was a decision that I respected.
Ex MIL wanted DD to join the her family on a trip to scatter FIL's ashes in the summer. DD also declined this. Her DF was fine about this.
Fast forward today DD has received the most awful letter from EX MIL calling DD selfish and cruel for not attending Ex FIL's funeral and several other horrible insults. This is from a woman who DD hasn't seen for at least 3 years.
AIBU In fantasising about verbally battering EX MIL ?