How do descriptive kinship systems distinguish lineal relatives from collateral relatives?

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Kinship An 18th-century family register listing births, marriages, and deaths within a kin group; in the National Archives, Washington, D.C.

In anthropology, descriptive kinship systems distinguish lineal relatives from collateral relatives by maintaining separate terminological categories for each. Lineal relatives are those in an individual's direct line of descent or ancestry, while collateral relatives are those who are not in that direct line.1

Unlike classificatory systems, which may group these relatives under the same term, descriptive systems ensure that specific genealogical relationships remain distinct. For example, in a purely descriptive system, a mother and a mother’s sister are assigned different terms, even though they share the same generation and sex. These systems are most commonly found in societies where the nuclear family functions as a relatively autonomous economic and social unit.1

It is important to note that the distinction between descriptive and classificatory systems is not always absolute; even systems that are primarily descriptive may use broader terms for certain collateral relatives, such as the English term "uncle," which can encompass various male relatives of the parental generation.1