I have a sister who has barely spoken to me, my mom, or my 2 brothers in over 3 years. 3 years ago she emailed the family with a 6 page email carrying on about the way we all perceived her, her lifestyle (she's gay), and her job. The statements she made were not accurate and I emailed her back to show her she was wrong. Since my mom and brothers agreed with me, my sister wrote us all off. I did a search on WebMD and found Narcissistic Personality Disorder. My sister is suffering from every symptom listed on that page. I'm no doctor, so I can not officially make this diagnosis. But I truely believe there is a serious problem here. How do I get her to see this and do something about it when she believes that me, mom and my brothers are all wrong? Any insight would be appreciated.