My opinion regarding this is more or less the same as the people who think you should just focus on your fiancé and say "to hell with them" when dealing with their family. When all is said and done the only thing that matters is that this is the person you want to spend the rest of your life with; who really gives a shit what their family thinks?

I'd say ignore these people completely and don't let them interfere with what you and your fiancé share; it's none of their business to try and get involved anyway. If someone tries to interfere with my relationship with my fiancé, that's the end of my friendship with those people; this includes her family or my own family. I don't really give a damn what they think, and it's not their place to butt their noses into the situation in the first place, regardless of who they are. 

All you need to think about is you and your fiancé; don't let other people ruin what you have.