My sister and I do not speak. She's a drug addict and constantly says and does things to my family that is just horrible and disgusting. (She even started a loud argument with my eldest sister while my grandma was literally on her death bed.) My mom wants me to invite her, dad says it's my choice and he doesn't blame me for not inviting her. I am however inviting the other 76+ members of my family. My parents are not helping with the wedding at all. Her daughter is my flower girl and with me all the time just as much as my own kids. Do I have to invite her? I don't want to but I'm not sure if it's a have to do thing.