Etymology
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paternity (n.)

mid-15c., paternite, "condition of being a father, relation of a father to a child or of God to mankind," from Old French paternité (12c.), from Late Latin paternitatem (nominative paternitas) "fatherly care, fatherhood," from Latin paternus "of a father," from pater (see father (n.)). Meaning "paternal origin, derivation from a father" is from 1868.

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filiation (n.)

1520s, "process of becoming, or state of being, a son," from French filiation, from Medieval Latin filiationem (nominative filiatio), noun of action from past-participle stem of filiare "to have a child," from Latin filius/filia "son/daughter" (see filial). As "relationship of a son or daughter to a parent" (correlative of paternity) from 1794.

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genuine (adj.)
1590s, "natural, not acquired," from Latin genuinus "native, natural, innate," from root of gignere "to beget, produce" (from PIE root *gene- "give birth, beget"), perhaps influenced in form by contrasting adulterinus "spurious." [Alternative etymology is from Latin genu "knee," from a supposed ancient custom of a father acknowledging paternity of a newborn by placing it on his knee.] Meaning "really proceeding from its reputed source" is from 1660s. Related: Genuinely; genuineness.
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