OK, I never do these types of posts, but I'd like to do a sanity check.

I am at a point in my life where I'm making a call.I was raised super-conservative christian. We were in the Church of Christ, pretty much Westboro but without the protesting.I'll make the story super short. Struggled with liking men as a christian, tried being a pastor, nearly committed suicide (I vomited the pills out), joined the Air Force, lost my faith, accepted I was an atheist, DADT was repealed, came out of the closet, lost most of my friends and family from my youth, gained new ones in the AF.My immediate family is mostly ok. Mom and sisters are cool, Dad and brother are not (I'm the oldest). I found a guy that I am actually interested in marrying and put a ring on him last year. Our wedding will be this July.All that said, My Dad and brother have stated that they aren't coming to the wedding because it would impede on their conscience or their salvation, I try to showcase how it wouldn't and they are hypocritical in how they view going to R rated movies, drinking, masturbating, etc etc etc. They wash it off by saying those things aren't premeditated and they repent afterwards.They had never had a conversation with me about losing my faith and recognizing my sexuality. When I came out to my dad, he never said a word. My brother never wanted to talk about it, neither did my dad.But now I'm stuck. They won't attend the wedding, they don't ever have a conversation with my fiance, and they don't have conversations with me unless it's shitty small talk leading to bible talk. I'm pretty sure I want to draw a line. I don't want anything to do with them if they can't attend the wedding. I couldn't talk to them about my sexuality as a youth, they weren't there for me coming out or anytime afterwards (to include when I gave my dad money because he couldn't make his mortgage), and they are choosing to not be at the wedding but still want to have an "understanding" so we can be around each other at Xmas or thanksgivings.I don't want that. If that they can't be apart of the biggest day of my life, I don't want them in my life.So my sanity check is... Am I being too harsh or unrealistic?If more info is needed or something, I can add it. But I just got off the phone with my brother who spoke to me for the first time in a year, and he reinforced that he will never change his mind but that we should find "common ground" so we can be "together as a family." I think it's a bullshit lie, and I don't want to live lies anymore, I lived them for the first 24 years of my life.So again, am I being to harsh or unrealistic? Any ideas how to go about it? I feel like I've dealt with it as rationally as I can and I'm about done. Any help or even criticisms are welcome. Thanks.