relation Look up relation at Dictionary.com
late 14c., from Anglo-Fr. relacioun, O.Fr. relacion (14c.), from L. relationem (nom. relatio) "a bringing back, restoring," 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.