early 15c. (late 12c. as a surname), "a mother or father; a forebear, ancestor," from Old French parent "father, parent, relative, kin" (11c.) and directly from Latin parentem (nominative parens) "father or mother, ancestor," noun use of present participle of parire "bring forth, give birth to, produce," from PIE root *pere- (1) "to produce, bring forth." Began to replace native elder after c. 1500.
word-forming element meaning "state or condition of being," from Old English -had "condition, quality, position" (as in cildhad "childhood," preosthad "priesthood," werhad "manhood"), cognate with German -heit/-keit, Dutch -heid, Old Frisian and Old Saxon -hed, all from Proto-Germanic *haidus "manner, quality," literally "bright appearance," from PIE (s)kai- (1) "bright, shining" (Cognates: Sanskrit ketu "brightness, appearance"). Originally a free-standing word (see hade); in Modern English it survives only in this suffix.
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Definitions of parenthood from WordNet
the state of being a parent;
to everyone's surprise, parenthood reformed the man