My fiance and his brother have never gotten along, but recently, they have been very on edge with each other. It got to the point where his brother was texting him physical threats and when we were all brought together due to a major family event, he ended up assaulting my fiance and ruining the event. My fiance is non-confrontational and wanted to just avoid his brother, but he wouldn't let him. We are getting married in just two weeks, and my fiance wants to un-invite him to our wedding. He is concerned that he won't be able to control his temper and will end up causing a scene on our wedding day. His parents are very upset with my fiance for not wanting his brother there and think that he should let him come no matter what because they are blood. They are guilting us, saying that we will hurt them too much by not letting him come, but is it really worth risking him keeping his temper in check? He is very aggressive and easily set off. I don't want him there either, but I want to do the right thing. Is it fair for us to un-invite him?