(Bolding Mine) No, of course not. But the number of conversations that my husband and I had, and the number of conversations that we had with his mother about this very issue beforehand are not insignificant. I don’t want to derail the thread, so I’ll keep this brief, but there actually is a lot to say on the issue. While we would not have cut someone out for that, it would have changed things dramatically between us. How dramatically? Well that would depend on who this person was, how they’ve treated us prior to this, how they treated us after, what their attitude and tone was like when they told us they weren’t going, etc.
As far as thinking that people are duty bound to go? No, we didn’t much care. People who went out of our way to tell us they weren’t going and that it was because we were making an “invalid” attempt at being married…that’s a different story. (Well, it would have been. Fortunately, it didn’t happen.)
But, this is the OP’s mom. The people I’m talking about are extended family. I know that if my own mother, or my MIL told us that they would not be at our wedding because even the act of going would be immoral, it would have been different. If it had been my mom, I would have been crushed, since we’ve always been so close. Our relationship would never be the same again. Not out of anger, but out of hurt. If she refused to go to my wedding, then exactly how am I supposed to let her be a doting grandmother? Those children came from the marriage she abhors. I would just never feel a real sense of closeness, caring, or intimacy again if she rejected my marriage like that. Call me petulant if you will, but I suspect that my reaction falls well within the norm.