Seriously, do you and I have the same family? Good LORD, it sounds like my messy situation, too... Don't you just hate it?
I know how you feel, not wanting to get married strictly because your family doesn't get along, or you don't get along with some of them and they hate everything...I know. My mom hates my dad, and he hates her, and they're both remarried and hate each other's spouses. My sister doesn't speak to anyone in family except for my evil grandmother who likes to hurt and control people, especially my selfish brother who doesn't get along with my mom at the moment because he's siding with my grandma...it's a MESS. I want to run and hide, too, girl, but here's something to get through your head: IT'LL BE YOUR WEDDING DAY AND IT WON'T BE ABOUT THEM, AND IF THEY ARE THAT SELFISH AND PIG-HEADED AT THE WEDDING THAT'S SUPPOSED TO BE YOUR DAMN DAY, THEN YOU HAVE YOUR ANSWER RIGHT THERE AS TO WHO TRULY LOVES YOU.
And, you have every right to shout that it IS you and your fiance's wedding day and ask them, or DEMAND that they put their sh*t away for one day and just let it go... I know, FAT chance of that happening, but it's worth a shot. I'm planning on letting some hell break loose if my family starts being assholes...