My fiance and I are having a very small bridal party. He has asked his very best friend to be his best man and he is considering a second groomsman, that's it. The very thought of having to find a potential third groomsmen stresses him out. My big sis is my maid of honor and my very best friend is a bridesmaid, (I was in her wedding party.) Do I need to include my fiance's only sibling/sister in my wedding party? She is 5 years younger than me and although she is very sweet and we get along just fine, we are not very close. I have known her for 7 years now.