So I've been caught in the middle of family drama for the past couple years. My two older sisters hate eachother for reasons I'm not going to get into. One of them said they won't come to my wedding if my oldest sister is there. And my oldest sister promised me she would be very civil, or just not even talk to the other if she did come. I told them both I'm not uninviting anybody and I want them both to be there. The question is, do I still send her a save the date and an invitation regardless of her choice? I have no doubt they would would be proper on my wedding day if they absolutely had to. I just don't want her to change her mind and not have the invite.. Would it be rude to mail her regardless of not wanting to come?