Who else has a nasty narcissistic sister?

I have a sister who likes to start really bad rumors about me and we don't even live in the same state I still live in my hometown and she lives in Kansas!she even lied and said that her husband watching one of her children but it wasn't true because my sister was just having an affair with a married man and wanted to take the focus off of her. She literally try to blackmail her own husband she said that she wouldn't call the cops unless she got the house in the cars! She is literally the worst person I've ever met in my life all she does is cause me pain and heartache!does anybody else have a really crappy sister like that?