I was surprised that my mom did. She is the one who spent the most amount of time with my W. All of it came out as I have been going through this process. I think a lot of it has to do with different values and up-bringing. The funny thing is that my mom D'd my dad when I was in K and he had no warning. Now this has happened to me without any warning I think it has been hard for my mom to process.
Most of what my mom didn't like was her selfishness and that she really never made them feel comfortable when they visited. My W is not the cook a full meal and sit down at the table kind of person. That was not how she was raised so some of the more traditional stereotypes of what women are supposed to do or the family is missing. She would much rather go out for Chinese food on Thanksgiving than eat a turkey.
