All of this creeps me out, but because she always does this when other relatives are around, and I'm new to the family, I don't feel I can snap at her or push her away. My wife alternates between being intimidated by her sister and feeling she has to protect her, and she refuses to say anything to her. She now seems to blame me for being offended! Do I keep trying to get through to my wife? Demand my sister-in-law explain her actions? Talk to her husband? Threaten to go to the police?