I'm very, very far from being an expert, Pach, but I would guess (and it's just a guess) that situations in an NPD person's early childhood require adoption of the NPD as a defence. In my mother's case, she was the youngest of four girls, none of whom (other than her) exhibited the slightest degree of narcissism. Nor did my grandmother, whom I knew well. I personally attribute my mother's condition to the fact that she was born right into a time of terrible, terrifying family trouble, lasting several years, that could only too easily have distracted her mother from the kind of personalized attention every single baby and toddler needs. And make no mistake, I sincerely believe my mother tried very hard to be both a good mother and a good person. As the result of her own early childhood, she just (alas) didn't have what it takes. Take care.