The main aim of the psychology of family is to examine the main reason of people have a family and their close relation between them. As many people know, the main structure of a family is based on the history of their biological process. The other factors that support is are the history, anthropological, sociology of the family itself. Based on them, the family main system roots were found. The advantage of studying this family structure is helping us to find the evolution of our family systems. But, this method will not show us directly why our family relationship placed in the first place above all. This is mainly because the family relationship should be studied with another method such as psychology. With the combination of psychology, child development, and philosophy, we can understand why family forms the main base of our existence in this world.