Just a quick update from the OP: this isn't the first threat my mother gave me about this. She actually influenced my sister to have the same stance. Me and my sister worked it out, but my mom crossed the line. She brings this up when it benefits her ulterior motive to reunite the family (ain't mad at her for that), but it shouldn't be brought up while we're announcing our engagement, or introducing both families for the first time, or a casual conversation months later about us getting on the same insurance. The saddest part is... Me and the missus were planning on having only our closest immediate family. It was going to be around 10 total people. I told her she doesn't have to worry anymore: no need for them to go. Not even bitter. I just want to keep the focus on the happy couple and not use our day as a family counseling session.