Animal Family

History of the family
The diverse data coming from ethnography, history, law and social statistics, establish that the human family is an institution and not a biological fact founded on the natural relationship of consanguinity.
Early scholars of family history applied Darwin's biological theory of evolution in their theory of evolution of family systems. American anthropologist Lewis H. Morgan published Ancient Society in 1877 based on his theory of the three stages of human progress from Savagery through Barbarism to Civilization. Morgan's book was the "inspiration for Friedrich Engels' book" The Origin of the Family, Private Property and the State published in 1884.