My SIL is bipolar and when she is manic it's very stressing. She fixates on a topic and says and does things to inflame the situation. She'll just go on and on about a subject even though we've all told her "we get it". She then pulls out the mental illness guilt example: I'm mentally ill, but nobody cares, they only care about people who have this or that, etc...When I or we tell her "enough already, stop" she goes ballistic and starts threatening and saying how much she hates us and/or me, and accuses us of "yelling at her" and then she starts lashing out at everyone who tries to intervene, etc...etc...I am the one she turns her verbal anger on and although I know I shouldn't I do just really get her riled and dish the verbal lashing back in her direction until I've had enough. I usually end up laughing at her and walk away, but now she has so much hatred and animosity I don't know what to do for the greater good of the entire family. I've tried for years to keep the peace, play nice and be the diffuser of her wrath. I'm tired of being her so-called punching bag and I'm tired of the drama and anxiety she causes. What should I do?