Kanji 親 parent, intimacy, relative 等 etc., and so forth, class (first) Related words 血けつ 族ぞく 血族 refers to blood relatives in general, while 親等 is the specific legal measure of how close that blood relationship is.
姻いん 族ぞく 姻族 refers to relatives by marriage (in-laws), whereas 親等 is primarily used for blood relationships, though it can also apply to affinity in some legal contexts.
Word family first degree of kinship
third degree of kinship
second degree of kinship
Etymology Compound of 親 (しん , 'parent; relative') and 等 (とう , 'grade; class'), literally meaning 'kinship grade'. The term is a modern legal coinage based on classical Chinese elements.
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