Don’t want his sisters as bridesmaids?

Pearl

We just got engaged yesterday but have been talking about our wedding for a while. I already wanted my best friend as my maid of honor and I have 3 sisters of my own that will also be bridesmaids. Originally I also planned to have his 2 sisters be bridesmaids. I already thought it was too many since our wedding is going to be small, I don’t want half the guests to be in the bridal party. Recently, his sisters have been horrible to us and only nice when it benefits them. One of them can’t enjoy herself unless the day is about her so I told him I was just going to have my sisters and friend in the bridal party. He didn’t care he just wants to marry me and he knows how his sisters can be. I still feel bad for taking them out completely. Are there any other roles I could put them in to still have them be a part of the wedding? They are 28 and 18, so not flower girl.