I posted earlier in the thread that I am sure that DS2-18 (my stepson who I raised) is a psychopath/sociopath. I think I have known for a long time. He was a textbook case of Reactive Attachment Disorder/Developmental Trauma, having been exposed to drugs and alcohol in utero and neglected as an infant as well as being separated traumatically from his birth mother when he was 7 months old. In retrospect, I wish I knew then what I know now about attachment - DH and I would have parented him therapeutically from the beginning rather than using normal parenting techniques. I can't say for sure it would have made a difference though. He was diagnosed at about 10 or 11 with RAD, but we had been seeking help since he was four with his behaviours, which included stealing, constant lying, manipulating others, triangulation of adults, soiling and smearing as a weapon, firesetting, destruction of everything, no remorse or empathy, difficulty with eye contact except when lying and many other abhorrent behaviours all the while being superficially charming to people to who don't really know him.
I have recently discovered that he also sexually abused one of my other DC over a period of six years. He was between 5 and 11 at the time. She had suppressed the memories and dissociated and then at adolescence began having mental health problems in line with PTSD. She is in therapy now and hopefully can put this behind her. We thought we were so vigilent in looking out for things like this and never trusted him but he was able to pull it off. He was so clever, sneaky and manipulative and he terrorised and threatened her. :(
We had to have him accommodated when he was 11 as at that point we felt we needed to for the safety of the rest of the family. We advocated for him throughout his childhood, seeking therapies, medications, and finally an excellent residential EBD school. When he turned 16, he decided he couldn't be bothered and left there. He has since descended into a life of crime. He is currently on remand awaiting court - I understand he has several pending charges against him.
I have to go now, may post more later...