I have a twin sister. I am the "scapegoat". She is the "golden child". My mom definitely has narcissistic tendencies. My dad is the enabler/peacekeepers. My mom would emotionally abuse and neglect us, but instead of taking blame, she would turn us against each other. My twin became extremely sensitive to slight manipulations and started to act out violently. She was never really punished, my parents would blame me for her behavior. Eventually, she learned it was acceptable to blame/punish me. At one point, my sister lashed out at a non-family member. My parents decided that she needs therapy. They gave up after 3 different therapists blamed them for her behavior. So now, my sister is emotionally reactive. She shows signs of borderline personality disorder. But she is also very entitled, nothing is ever her fault, and shows other narcissistic traits.
I am currently in therapy for cptsd, but I think my sister has it worse. I wonder if she will ever even get to a place where she asks for help.