My sister is my maid of honor- we have never been close, in fact it is rare for us to get along (we now usually just stay distant and avoid conflict). At my engagement party, we sat her next to my and my fiance's very close friend who is officiating our wedding, because they are similar in age and would probably be able to hold conversation better than our other guests at the engagement party. I noticed them flirting at the party, and asked my fiance to speak with our friend to warn him on not being intimate with my sister, but he forgot to speak with him.. two weeks later, we hear from that friend that my sister has been pursuing him fever since (she asked him to not tell us that she's been talking to him), and that they were planning to go to dinner that weekend. We asked him to end it immediately or wait to be serious and intimate until after our wedding and disclosed information on my sister- she's not very mentally stable, and does not date exclusively (already is seeing multiple men), and has not had a healthy relationship in 5+years. This seemed to blow up in our faces and made her more enticing, because they spent the entire weekend together. If it was a more mentally stable person involved in our wedding dating our friend, it'd be a different story, but my sister does not hesitate to make public scenes and often cries in public over small triggers (i.e. discussing business versus asking her how her day is). My issue is on what to do from here because I can 100% say that they will see each other for a month TOPS- but my sister will undoubtedly make a scene at my wedding if they are not on great terms. Do I kick them both out of standing up? What would you do?
This is THE LAST stressful thing I need piled on to my plate. My MOH already doesn't do any miad of honor things (I expected as much) and staying neutral in the planning process is one thing (not helping nor hurting) but when you add stress and negativity to the planning without any positives, you have to be the most inconsiderate selfish person, ever.