NPD isn't a horrible thing. I know a number of people who suffer
  from it. THEY don't know they're suffering but they got the
  diagnosis and are rather proud of it in fact. So, you learn to
  work around them. NPD isn't something to be scared of. It's just
  something one has to work around when a family member has it.
  It's not a big bad scary thing. Same with Oppositional Defiant
  Disorder. If you have it, you work on yourself. If you know
  someone who has it, you work around it.