somat.
Have to disagree totally!

In psychology there is no longer such a thing as a nature nurture debate.

Yes there is, no good psychologist would rule anything out, all lines of thought and debate should be open. A closed mind, a absolute attitude is not good or open to new research.

Narcissism absolutely runs in families!! What have you been reading!!

Narcissism, Pathological narcissism, NPD is similar to psychopathy in as much as these individuals do not feel empathy.

I am not talking about 'traits' per say, traits can be learnt they are not the same as a innate PD.
Learnt traits can be changed, if that person wants to change.

My father was 'insecure' a fragile narc, but, still a narc who failed to care properly for his children, totally self centered. He was not 'deliberately' cruel however, he was just unaware, oblivious, to the dreadful hurt he caused to his children.
My mother was a covert narc, but malignant. A malignant narc is the worse kind, they know what they are doing and ENJOY causing hurt.

I remember falling down the stairs heavily as a child, top to bottom, bang, bang, bang, crashing to the floor stunned, shocked, hurt and shaking. Mother glanced up from her book and turned away with a sly smile, a smirk, playing on her lips.
She left me to get myself up, I said 'mum I fell down the stairs' she said 'Oh? I never noticed'

I suppose that don't sound much, but I knew from that day on, I was on my own.
No hugs, no comfort, cuddles, no reassurance. Nothing. But a smile.