<Tr> <Th> Children </Th> <Td> </Td> </Tr> <Tr> <Th> Parent (s) </Th> <Td> Bobby Troup Cynthia Hare </Td> </Tr> <P> Ronne Troup (born June 10, 1945 in Bryn Mawr, Pennsylvania) is an American actress and educator best known for her 1970--72 role as "Polly Williams Douglas" on the long - running sitcom My Three Sons . </P> <P> Troup is the daughter of musician / actor Bobby Troup, and his first wife, Cynthia Hare, and the stepdaughter of actress / singer Julie London . Ronne Troup attended North Hollywood High School . </P>

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