Okay so my sister and MOH is about 2 1/2 years older than me and dated this guy when I was in Jr. High (HS for her) for like 5 years. I literally knew him since I was like 13 until I went off to college. I've always considered him my big brother and he always called me his big sister. Well when I was a sophomore in college, he and my sister broke up. She now dates my FH's friend and has basically been forbidden to have contact with her ex. Her ex and I have stayed in contact on and off since they broke up but now that I'm planning my wedding, I kind of want him there. I spoke to my sister about it and she's worried about the drama that may happen since her current bf has a pretty bad temper and is really jealous. A part of me feels like it's MY day but I don't want people, including my sister, to be uncomfortable. What should I do??