Crossword clues for Sister of Castor 8 letters:OLIVEOYLSister of CastorOLIVEWith 65-Down, toon sister of CastorHELENSister of Castor and PolluxHELENSister of CastorHELENESister of Castor and Pollux.OYLSBrother Castor and sister OliveOLIVECastor Oyl's sister