Allow for a smidgeon of humanity really Jane? If someone can shot dead their two parents and two young boys they would have absolutely no humanity at all!
Which begs the question-----which sibling suffered from narcissistic personality behaviour ?
In it's advanced form:
Relationship difficulties.
Problems at work or school.
Depression and anxiety.
Physical health problems.
Drug or alcohol misuse.
Suicidal thoughts or behaviour.
Both overprotective and also neglectful parenting can both have an impact, as can mis-matches in parent/child relationships. Genetics ( unknown birth father to Sheila ) Neurobiology---connection between the brain and behaviour and thinking.
Which psychiatrists were correct in their diagnosis of both Sheila and Jeremy ?
Sheila had had a multitude of mental health problems, probably beginning with her first trauma of a termination, followed by other birth traumas-----PTSD today which is treated from when it becomes evident. Left untreated/undiscovered/undiagnosed it can lead to severe mental health problems.