Yes, they were brothers' OR WERE THEY? Whomever supplied this
answer should give their source. I've read several IMDB and
Wikipedia biographies of Carlson and none of them mention any
brother, or any relationship to Marlowe.
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"Elmer Gantry" (1960). Stars Burt Lancaster, Jean Simmons,
Arthur Kennedy, Dean Jagger, Shirley Jones, Patti Page, Hugh
Marlowe.