Classificatory kinship systems, as defined by
Lewis Henry Morgan
Lewis Henry Morgan (November 21, 1818 – December 17, 1881) was a pioneering American anthropologist and social theorist who worked as a railroad lawyer. He is best known for his work on kinship and social structure, his theories of social evol ...
, put people into society-wide
kinship
In anthropology, kinship is the web of social relationships that form an important part of the lives of all humans in all societies, although its exact meanings even within this discipline are often debated. Anthropologist Robin Fox says that ...
classes based on abstract relationship rules. These may have to do with
genealogical
Genealogy () is the study of families, family history, and the tracing of their lineages. Genealogists use oral interviews, historical records, genetic analysis, and other records to obtain information about a family and to demonstrate kinsh ...
relations locally (e.g., son to father, daughter to mother, daughter to father), but the classes bear no overall relation to genetic closeness. If a total stranger marries into the society, for example, they may be placed in the appropriate class opposite their spouse.
It uses kinship terms that merge or equate genealogically distinct relatives from one another. Here, the same term is used for different kin.
The
Dravidian kinship-term system, discovered in 1964, is an example of a classificatory kin-term logic.
Anthropology
Kinship terminology
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Morgan believed this resulted from a "promiscuous" stage of evolutionary development, where it would have been impossible for tribes or families to tell a father from an uncle, a cousin from a brother and a son from a nephew. However modern anthropologists do not believe in this 'stage'.