About 2 or 3 weeks ago I saw my sister’s husband out with another woman and decided to tell her about it. She has been trying to leave him ever since but whenever she does he threatens her and me (because I ruined his life). He says he would do anything to convince my husband and my family that the baby I’m expecting isn’t my husband’s and the the baby my sister has isn’t his...even if that means doctoring pictures to make it look like my sister and I are both cheating. He also threatens with sending her private pictures to our dad and the rest of the family. I don’t know what to do to help her. I also worry about my pregnancy because I already had a threatened miscarriage once and I don’t want the stress of thinking what he might do to affect my baby.