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.

In the earlier days, the form of family formed by people who life grouped in cave or forest. Although the main purpose of this grouping action is to protect the tribe from wild animals, this group of people could be categorized as family because all of the members of this tribe share the similar factors of family. In other side, the reason of having large member to attack or defend their tribe, gather foods for all members, warn each other for natural disaster, raise children in a community are very similar with the reason of living in the modern societies. In the small scale of family in earliest day, the scale only covers a tribe in a forest. But, in the large scale is covers the entire tribe in forest called family. The problem of this large scale family is a person usually wants to have a better life.

The psychology of family could be divided into two main branches, the psychology of family structures and the psychology of family interactions or relationships. Both of them are important to study if we want to know about the family itself.