Future, at the point that question truly "matters", the only one you have to answer to is yourself and whetehr or not you can accept/integrate her back into your life. If/when the answer becomes "yes", then it's almost irrelevant what they think. There's no reason you can't explain the "facts" to them as you have on this board. Your reasons are "real". IMO, your extended family have taken and will take their cues from you, if they don't, that's their problem, not yours.
I guess your right AlexEN, the thought of us sitting around my parents dinner table at some future holiday is not pleasant, but if we are truly reconciled, and if we are acting happy and in love with each other, then my family should come around.
Just today we were at my son's basketball game, and after the game my W asked if we all wanted to go out to lunch together. I took cues from my parents and quickly made an excuse to say no thanks. She looked a little hurt. She really doesn't get how much damage she's done. She thinks because her and I are on reasonably good term that my parents will just forgive and forget. Not gonna happen any time soon.