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No, the characters were "identical cousins".
Part of the theme song was: They laugh alike, They walk alike, Sometimes they even talk alike, you could lose your mind! When cousins, are two of a kind!
Of course, Patty Duke played both roles, as "Patty" and as "Cathy, the cousin".
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Earn +20 ptsQ: Did Patty on The Patty Duke Show Patty have a twin sister?
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