Hi artsy, Wow, parent issues are are the biggest part of my W's MLC journey for sure. It was also true that during the years we were M my W had little contact with her father and now is constantly in contact with him, sometimes talking 3-4 times a day on the phone and texting all day. The difference in my sitch is that he has actively tried to get her to leave me. It's almost like he see's me as a rival for her affections. I know for a fact that FIL's parents, especially his mother, were VERY cold. They had some very crazy ideas about parenting that really damaged their kids (FIL's sister is a heartless person who rejected her first son because he was born with a disfigurement while doting on her youngest son). Very messed up family that my W and I had little contact with until post B-day. Be glad that while they may not have contacted you, at least they aren't actively aiding your H and egging him on! Just goes to show how MLC is an issue that started long before we came into the picture.
About taking the "high road"...I went to a party for my W's grandmothers 96th birthday 2 weeks ago. All my W's family but they wanted me to be there. When the hostess, my W's cousin, said to my W (in front of my kids by the way. My D19 told me about this) that she was glad that I came knowing that she had moved out of the house, my wife said "Well, if there's any trouble, it won't come from me!". Her cousin hadn't inferred she thought there would be "trouble", all she was saying was that it was good that we were able to both be there and enjoy family time. I have always been nothing but respectful to her both in public and in private. Maybe a little projection there on W's part? Probably it would be easier for the WAS and in some cases the family, if the LBS were to be less than respectful. The stress probably comes from the fact that they can't say what horrible people we are!