Man is a social creature. His personality development reflects his experiences with other people. Interpersonal relationships contribute to individuality rather than similarity of development, for no two of us have exactly the same acquaintances nor do we have an identical relationship with the people we do know in common.
Even parents relate to their various children in somewhat different ways. The experiences of love and hate, of friendship and distrust, of shared experience and misunderstanding which marks our association with other people are in each case unique.
Although we have many kinds of interpersonal relationships in the course of our lives, those that have the greatest influence in shaping our development are those with our parents and with members of our peer groups.