Unilineal descent means that relatives outside one's own descent line are avoided if at all possible.

Name: Unilineal descent means that relatives outside one's own descent line are avoided if at all possible.
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Unilineal descent is a system in which ancestry is traced exclusively through one parental line, either the mother's line (matrilineal) or the father's line (patrilineal). It does not necessarily involve avoiding relatives outside one's own descent line.

Unilineal Descent Means That Relatives Outside One's Own Descent Line