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Cady graduated from Stanford University.
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He has two children: Steve and Catherine and he is married to a woman named Shirley.
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He is the only actor to play a recurring character on three TV sitcoms at the same time (Beverly Hillbillies, Green Acres, and Petticoat Junction) from 1968 to 1969.
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He is one of only three co-stars of "Petticoat Junction" (1963) who stayed with the series for its entire seven-year run (the other two being Edgar Buchanan and Linda Henning).