My mom wants me to ask my sister to be a bridesmaid, but I'm really not that close to her. It seems that every time we see her since getting engaged, she gets extremly jealous because her little sister is getting married before her. I'd hate to involve her in the wedding if she is going to be grumpy the entire time and ruin it for us. My mom says that she regrets not having her sister as a bridesmaid, and I think that's the main reason why she wants me to use my sister. Any ideas on how to break it to my mom that I'd rather not have her as a bridesmaid?
Also, I'm going to be using my fiance's sister-in-law as a bridesmaid, because I've been so much closer to her than my actual sister in the past couple of years. Thoughts? I know it's going to be a touchy subject.