So my FI has 3 sisters I thought since I am asking him to have my homosexual best friend in his wedding party I would extend the invitation to him to have 1 or 2 of his sisters in my wedding party. I asked him which two he would like me to extend the invite to initially. We decided to only pick 1 or 2 because we both agreed we do not want a large wedding party with no more than maybe 5 people on each side. He stated he would like his oldest and youngest sister to be in my wedding party and if he could choose between the two he would pick his oldest sister because he is the closer to her. Initially, that was fine but my relationship with his oldest sister has since soured and I honestly barely want her at our wedding(biting the bullet on that lol) so while I would have no problem and be more than happy with his youngest or middle sister in my wedding party I want him to be happy and since he is up for my request I dont want to not fulfill his. I'm just torn because I want my wedding party and our events together to be fun filled with no drama and I feel like with my feelings towards her and her feelings towards me it would just be a bad idea for her to be more than a guest at our wedding. Any help?