There are three personality disorders which are related personality disorders, ‘cousins’ so to speak, to Narcissistic Personality Disorder. Officially, these three, and NPD, are known as the Cluster B personality disorders. It is possible that your mother could have some of these as well as there is often overlap.
The related personality disorders are:
- Borderline Personality Disorder
- Histrionic Personality Disorder
- Anti-Social Personality Disorder
Borderline Personality Disorder
People with BPD fear abandonment and will make frantic efforts to avoid this, or even the risk of it. Neediness is their hallmark. They tend to have a pattern of chaotic and unstable personal relationships. They either idealise people or totally devalue them. And indeed, somebody they originally idealised can, through one misstep (real or imagined) become totally devalued and even dropped entirely. They have an unstable sense of self, and can be reckless and impulsive. They can have recurring suicide attempts, or threats of suicide.
Histrionic Personality Disorder
People with Histrionic Personality Disorder crave attention as much as, or even more than, Narcissists. They can be highly dramatic and are always in some crisis or another. They can talk incessantly. They can also be very highly sexually promiscuous, especially inappropriately so.
Anti-Social Personality Disorder
More commonly known as sociopathy or psychopathy, AsPD is characterised by a complete lack of conscience, lack of empathy, and a total willingness to lie. They are sneaky and manipulative and will not hesitate to con others or break the law if they feel they can get away with it. These are the people who are happy to torture and kill animals, although not all do this.