My fiancé has two sisters. I am only close to one of them. She is 20 and I'm 21. My fiancés other sister is only 15. I am going ask the older sister who I am close with to be a bridesmaid. Should I also ask the younger sister to be a bridesmaid even though I am not close with her? Everyone else in the wedding is going to be over the age of 22. I also have two sisters and 3 really close friends I want as bridesmaids. Without including my fiancés youngest sister I would have an even number of bridesmaids, which I really want. What should I do?