What can I say? I have a soft spot for sincere people who show up here trying to help their families. It's a refreshing break from the usual garbage that people frequently spew on this forum.
NPD is quite rare. If you ask a random group about how it's affected their lives, most of them will say "Huh? Idk what that is. But I had a neighbour once who was schizophrenic/bipolar/ very strange but Idk what his problem was."
There is plenty of online discussion about it, but I've never met anybody IRL who was formally dx'ed with NPD. I've only met 2 people who could possibly come under scrutiny for some kind of narc disorder, but they were both tenured profs at my uni. So it's just as likely that they were just self centered assholes.