Welcome and thank you for sharing. Your story is so painful to read. I wish the psychiatrist or family you moved in with had told child protective services about your parents so that you and your siblings could have been better protected.i have had to learn later in life that it is hard to see a person may have true psychiatric issues who is so close to you. My brother is the cruel one in my history. Since letting him bck in my life for a short time he caused harm to me again and my kids....affecting us emotionally, financially (huge), psychologically...
Read here about Narcissists: http://www.decision-making-confidence.com/symptoms-of-narcissism.html
Read here about Sociopaths: http://www.naturalnews.com/036112_sociopaths_cults_influence.html
That said, you could send a video message, you could send a recorded message to your parents. I agree sending your parents separate messages is a good thing. Perhaps send a letter with picture of your kids to her.