My FI's SIL can't stand me. I have no idea why, as I did not do anything to her. The feeling is not mutual. I have tried for years to be as nice as I can, making gesture after gesture of friendship, which is hard considering she makes no effort to hide her feelings. But after years of being treated like the dog s--t she stepped in, I've beyond reached the end of my rope. Mediation has not worked; she says there's no problem but her attitude continues to say otherwise.
Now, my FI wants me to include her as part of my wedding party, and I have flat out told him "No" on multiple occasions. I don't want that kind of negativity around me on my wedding day, or any day leading up to it. He says he understands, but also says it would be "the ultimate gesture of friendship" if I asked. I am also getting pressure from my FMIL.
This relationship (or lack thereof) is hurting the relationship my FI has with his brother. I don't want to be the cause of that. But I do not want this woman around me on my wedding day.
Does anyone have any kind of advice?