There is tons of information on this online. Just google it in. I have a former mother-in-law and an uncle who have this personality disorder. It is extreme selfishness, egotism, conceitedness and self-love. They have a very distorted image of their importance to the world. They cannot demand attention at all costs. These people are very abusive and cannot find their way to care for others or to see the pain of others. Everything in life is about them. If you fall down and skin your knee, you are causing her suffering by having to care for you and you did it just to make her miserable. They are often hateful and verbally abusive.
This is a very serious disorder not only because of the devastation they create to their family and friends, but because they are not able to see they have a problem. Thus, it never gets treated. It always those who suffer their abuse that research and seek help. It is very sad and narcissistic parents injure their children for life. It's very painful. I hope this helps.