relation (n.) Look up relation at Dictionary.com
late 14c., "connection, correspondence;" also "act of telling," from Anglo-French relacioun, Old French relacion "report, connection" (14c.), from Latin relationem (nominative relatio) "a bringing back, restoring; a report, proposition," from relatus (see relate). Meaning "person related by blood or marriage" first attested c.1500. Stand-alone phrase no relation "not in the same family" is attested by 1930.