Should i have Best Friend as Bridesmaid?

If your FH insists on his sisters being in the wedding and you aren't close to them, he should have asked them to be on his side. The same with your brother. Now that you've already asked, I definitely wouldn't change it. Just add your BF to the party, I don't see why you wouldn't.

I don't really understand why you wouldn't have your best friend as a bridesmaid. Whether your FH's sisters and your brother are on your side or your FH's doesn't matter in this decision, that's a whole different topic. If your best friend really is your best friend, she should be your bridesmaid. You can have your FH's sisters on your side or his, same thing with your brother. My BIL (sister's husband) is on my FH's side and his sister is on mine. It was never really a discussion, it was just assumed between the two of us. But again, regardless of where you decide to have your siblings stand, I don't see why that would keep you from having your best friend as a bridesmaid. I also don't think it matters in the slightest whether your FMIL appreciates where YOUR wedding party members stand. To me, this sounds like a simple decision.

You absolutely should have your best friend as a BM if you feel like she is someone who has supported you throughout your life. It's nice of you to be willing to include your FH's sisters, but he really shouldn't dictate who you get to include since they will be spending more time with you than with him at bridal events. It's fine if the sides are uneven. Maybe there are one or two friends FH could include on his side?

I talked to my mother and sister and they agree that if I really want my best friend there then I should have her as a bridesmaid.

However, my Fiance doesn't like the idea of having such uneven parties.

I suggested that his sisters stand on his side and my brother stand on my side, so that it'd be even. However, his response to that was "I like the idea of having each side mixed because we're mixing our families."

Cute, I guess. We'll definitely have to have a follow-up conversation about it.

I don't see why you can't ask your best friend to be your bridesmaid?

Your best friend cant be a bridesmaid if you don't ask her to be, if you think you would regret it then ask her to stand by your side. And don't let his sisters standing up influence that decision.

He's being ridiculous. He could have the bridal party both mixed and even (even assuming that was important) if just one of his sisters was on his side, and the other was on yours. Alternatively, since he's okay with having two on his side and three on yours, he's already got uneven sides, regardless of whether your friend is added to yours. Insisting that your best friend can't be in the bridal party for the reasons he has given doesn't make sense.

You should have who you want beside you on your wedding day. You shouldn't feel forced to include his family and you shouldn't feel like there isn't space for someone who means a lot to you. I think you should include your BF, because it sounds like you will really regret it if you don't.

I'd suggest including your BF, even if that means you have an "extra" bridesmaid or uneven bridal parties. I also think your idea of having your brother on your side and his sisters on his side is a great idea, and if your FH is fine with it, it sounds like a perfect solution. Even if your FMIL may not on board, it's not her decision. Having co-ed wedding parties is not insulting and not a sign of a lack of respect for her. It's simply not her wedding, her child that is getting married is okay with it, and all her children get to be involved, so if she's stuck on tradition I think she just needs to come around and realize that co-ed wedding parties are not uncommon these days and that it's the best way to make sure everyone is included.