Blue, I think it is great you stood up to her. Where is the rest of the family when this happens? It sounds like they stand by and watch this abuse going down. That makes it ok in your sister's eyes. They aren't doing her or you or themselves any favors by allowing this sort of behavior. Our families can be our greatest mirrors and teachers and a huge opportunity is wasted every time they stand by...

My Grandma would have called her to the floor. My mom would have kicked her out. My Dad would have done one of those intimidating Dad yells.... Where are those forces in her life? Crap like this only goes down if it is allowed.