I do not have a great relationship with my sister-in-law. She was upset when I got engaged because we were engaged at the same time, however, she got married first and I waited until after her wedding to begin planning mine (which was a 7-month span of time). I have already chosen my bridesmaids and it is nonnegotiable who is in my bridal party. I did not put my sister-in-law in my party because I do not want her negativity affecting my big day and my friends. I cannot just exclude her though, I know it is my wedding and I can choose what happens, but I am not looking to cause drama in my family. This is my brother's wife after all. What would be a good position for her to be in that won't offend her but also won't make me alter my entire wedding party. Again she has to have some part in my wedding.