I have never gotten on with my SIL. She's always been nasty to me in a very underhand way. I never confronted her in order to keep family peace. But the final straw came at my wedding where she went out of her way to spoil it for us. There was lots of things but the worst was bringing up my husbands affair. I knew about it, five years had passed and we'd moved on. So she had no good reason to mention this at our wedding.
Anyway, her wedding is booked for this year and I've recently found out that her soon to be DH has shagged one of her bridesmaids. He's had other affairs, but I don't think she knows about this one.
I really want to say to her at the wedding, 'I really admire you and DH. You've got such a strong relationship. I mean, I don't think I'd have been able to have one of my friends as bridesmaid if she and my husband had been having sex' . This would totally play on the fact that she harps on about how her and DP have a better relationship than basically anyone else, but particularly me and DH.
I know this makes me sound evil. I'm not in general but I want to get her back for the years of crap she's put me through.
So, WIBU to do this?