Many narcissists will suddenly erupt into what is called a narcissistic rage. This happens when the narcissist feels they have been slighted by not being the center of attention, unappreciated or misunderstood in the manner they deserve! Their rage is irrational & turns into revengeful hatred. The narcissist enjoys inflicting pain & getting even with the person who they believe has failed them.
Siblings Not Encouraged to Be Close: In healthy families, we encourage our children to be loving and close to each other. In narcissistic families, children are pitted against each other and taught competition. There is a constant comparison of who is doing better and who is not.