The book "The Origin of the Family System, the State, and Individual Property" by Friedrich Engels is considered an essential reference in Marxist philosophy, as it deals with the origin and development of family relations, and the relationship between those relations and economic changes. Engels draws on his analysis of various human societies throughout history, showing how methods of production and patterns of consumption influence the organization of the family and the state. The book deals with the idea of ​​class conflict and how the state developed with the changes in the components of society. It also discusses the relationship between material production and biological production through reproduction within the family system.