Stubbornhubby - I totally agree. It is awful that he has excluded the op's dh from the ceremony, it goes against the whole meaning of the ceremony.
This was 8 years ago FGS. I have said some stupid things when I was drunk that I regretted (not homophobic or racist but still insulting) and bitterly regretted it the next day. I apologised and never repeateed the incident and that was that, the injured party didnt sulk about it for nearly a decade!
My sister got married just in the middle of my parents very acrimonious and stressful separation, my mum and dad both attended, as did my father's mistress whom he had been sleeping with and who my father left his family to be with, they ALL attended, and you know what, there wasnt a bad word between any of them, even though it was very hard for my mum, she just held her head high and was civil, as were they all, for the sake of my sister and her husband, and the day went well.
The db should grow up, forgive and forget, or if not, the op should not go, and send out the message that he first loyalty is to her family and her dh, the db is about to get married himself, he should understand why his ds would put her dh first.
8 years ago, apologies, and they have met and been civil at times over the years since, but yet he is excluding the dh from this one occasion....immature and sulky behaviour.