OK so I knew from the start my eldest step would eventually be a challenge. Well I never expected her to be as sneaky and manipulative as she is. She has her father completely fooled. She antagonizes her sister till her sister causes a scene and she gets away with it. Example yesterday she was sitting there and her sister was repeatedly calling her name. Well eventually she said you better stop or I will hit you in the face. Wait. What? And even after telling her dad he just blamed everyone but the eldest. How do I stand by and let this continue.