Narcissists are not normal people.
They are a special kind of evil that is born out of mental illness and an inferiority complex. This causes them to be delusional. And they take out this delusion on people in the family. One person suffers the most though.
This person is the scape goat child. The scape goat child is someone who cannot do anything right in the eyes of the narcissistic parent. They are usually the black sheep of the family. This is because they have learned that no matter what they do they cannot please the narcissist. But because we live in a world with emphasis on the family, scapegoats still have some sort of jaded relationship with narcissistic parents.
The scape goat child usually escapes with various sorts of mental scars that still shapes his adult views on life. The adult life is crafted by the cruel intentions of the narcissist. The scape goat child usually has self esteem issues and some form of anxiety. But there is hope. We are in charge of our life after all.