I don't want my sister in my wedding
Why don't you want your sister there?
She is so boring and I'm tired of her bitchiness at the family party.
Afterall your sister is your family. You should accept her whatever she is. She'll be happy if you invite her to your wedding.
Who cares if she's happy.
You should want your own sister to be happy. Why not invite her and try to bond with her more at your wedding?