Perhaps your parents are narcissists, perhaps they are not. Having a trait or two doesn't make one a narcissist (as in, someone who has NPD). I'm sure you have traits, too ...except you call them "fleas". There are plenty of people who aren't diagnosable with a PD, but aren't very pleasant. Your therapist agreed your parents had traits based on what YOU told them. He/she has never met your parents to know the reality of the situation. So what are these narcissistic traits, and where have they been defined? Who doesn't share at least one of these traits?

Also, there are plenty of websites that list "x traits of a narcissist"... these websites aren't academic in nature. If we're talking about NPD, then we have the DSM for that. If we're talking about people who are arseholes, then I don't think we need a guide for that, or another label.

I don't see how this is helpful to be honest. What is it you're seeking exactly?