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Look-alike cousins Patty and Cathy Lane (both played by Patty Duke) have yin and yang personalities but double the teenage trouble when worldly Cathy comes to live with her American uncle, Martin (William Schallert), in this 1960s sitcom. The split screen is used to fine effect as the cousins bicker over boys, play practical jokes, and get in and out of scrapes together. Season 2 includes guest appearances by Sal Mineo and Sammy Davis Jr.