Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: (I do not believe this violates the violence policy as I am not advocating violence, it just happens to be an important part of the story)

I am getting married in 4 months.  We have been planning for about 2 years and my sister accepted being my maid of honor as soon as I got engaged.  I had more bridesmaids than my fiancee has groomsmen.  About two months ago my fiancee asked my sister's husband to be a groomsman to help even out the sides.  My fiancee has only met him a couple of times and only put him in because we didn't have anyone else at the time.  Our bridal party also includes their three children.

We found out this week he has physically abused my sister.  He threw her to the ground and broke her hand.  I do not live in the same country as her so I do not see their relationship on a daily basis.  She has begrudgingly confirmed this happened but refuses to acknowledge it as a problem.  

My fiancee does not want him standing up there with us.  I do not want him standing up there with us.  My fiancee has since been in contact with an old friend who has come back into town and he would like to include this old friend and replace my sister's husband.  WIBTA if I called my sister's husband and and told him that we have found someone else to be in the wedding party?  And WIBTA if I was truthful about why we were removing him?  We would not be uninviting him from the wedding completely, just the wedding party.

I believe there is a high likelihood my sister would refuse to come to the wedding meaning  the children would also not be there. It would also very likely cause additional drama in the family.

removing my sister's abusive husband from my wedding party