The psychology of family examines how and why we have families and close relationships as also the dynamics of family interactions. The structure of families is based on evolutionary biology, anthropology, history and sociology and the roots of family systems are found within these disciplines. However studying family structure will show us how family systems have evolved over time but may not directly tell us why family relationships develop in the first place. Family relationships are in turn studied with psychology, child development and philosophy and suggest why family forms the basis of our existence. The interdisciplinary approach to the study of family will have psychology at its core as human evolutionary biology, sociology, philosophy have significant psychological components.
To begin an answer to the questions on how family structures have developed, early evolutionary history and anthropology will suggest that family, albeit in a different form is the basis of human civilization. The earliest men who lived in caves and forests, quickly formed groups or tribes to protect themselves from wild animals. Research into anthropological remains has shown the life of primitive humans who were cave dwellers. Forming herds was one of the basic security and safety needs of humans as by forming a large family they could attack or defend themselves against wild animals, warn each other of natural disasters, gather food and raise children in a community, almost like modern day societies. Thus the earliest families were tribes or herds and there were several generations of humans in one family. Family sizes were thus presumably large with entire forest tribes forming single families. However this tribal system of forming large communities possibly did not last long and some humans wanted a different kind of life and migrated to places where there were no communities or tribes. Some others may have simply weighed the disadvantages of a group life as insurmountable and reasons could be possible jealousy regarding mates, dissatisfaction in sharing food, shelter and apathy for the rules of a community life.
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