Hey Wind, I don't know who this guy but I'm having trouble buying into his story. He's either entertaining or a very extreme case. It is interesting and he has made some really sharp statements and observations.
The psychopathic physiology is very low-key, but family connections are genetic and subconsciously driven, if he isn't actively hostile to his brother, the mental calculation would always impel him to act on his behalf. At the genetic level, there is always an instinctive drive for survival which would include close family members. Serious trauma would otherwise result....but then serious trauma is one of the underpinnings of psychopathy. Hmm, that's a conundrum.
I've got to get to work...