My fiancee and I are getting married in June, and we're going through the guest list. I want to invite my really good friend, we'll call him T, who I grew up with and he's like a brother to me, I call him my bro. But him and my sister's new husband hate each other, it runs real deep. I'm thinking that if I invite them both, they'll come to blows. My fiancee and I think that it's best not to invite my brother-in-law, so we don't have any drama. We'll still invite my sister, who I'm close to, but I can't have her husband there. I've known T since forever, and I can't imagine getting married to my girl without him there. I told my brother-in-law that I have no problem with him coming, but if he can't learn to get along with my bro, he can't come. I don't think they'll be able to resolve it. What's the best way of telling him he's not invited without hurting my sister?