When discussing our gueat list, my fiance made a point that my baby sister not be invited. My sister is a bit of a drama queen and very selfish. When attending family affairs she is constantly on her phone. During conversations with my fiance, she argues about EVERYTHING, she always has to be right. A know-it-all. Through the years, he has seen how she treated my grandmother, myself and people who have come and out of her life. When given advice she ignores and continues to complain about her situation. Shes a pathological liar and uses men for money or uses people in general. If it doesnt benefit her, she doesnt do anything for anyone. She's spoiled and uses mental health as an excuse to be one. If she doesnt get her way, she's angry all the time until ahe does. With that in mind, my fiance hates her. He refuses her to attend the wedding because she is a negative person and may ruin our day. And because its his wedding too, I have to respect his wishes because he would do the same for me. How do I tell her gently that she wasnt invited to our wedding?