I agree with the above.

In my opinion, you did nothing wrong, you're right, you stood your ground and shouldn't have to smooth things out with the parents. See how you're already being manipulated right there? You're being dragged into something awful, and that's for your fiancé and her family to sort out, not you.

But you can take the gamble and keep investing time and energy on this relationship, hoping that things will work themselves out, or you can try and perform a "rescue mission" that is likely to backfire.

You think your relationship is great because you bend over and backwards for your fiancé and at the same time you ignore her inability to compromise.

I understand why you are reluctant to see things as they are, you weigh the pros and dismiss the cons because you believe that it's worth it just because of the pros. But at some point your "self-preservation" has got to kick in.

If you think she's really worth it (I'm not judging, I only know your half of the story), then you can try the "rescue mission" thing, but you're gonna have to make sure that she's all-in and ready to break free from the evil parents and sister, else it's gonna end in tears for you.

Question is: is she ready for that?