Has anyone wondered why we develop the personality that we do? For example, I am INFJ (Ni Fe Ti Se). My mother has strong Fe (ESFJ) and my father has strong Ti (INTP). Is this why I am INFJ rather than say INTJ? What I am asking is basically why did I develop this personality, and in what ways do external factors play in? (Would a close friend or family member dying increase Fi?)