 Charles B. Fitzsimons (1924–2001), a former actor, was Maureen O'Hara's younger brother.In addition to his listing as producer, the film's opening credits indicate "song by Marlin Skiles & Charles B. Fitzsimons; sung by Maureen O'Hara" (the title of the song, which is heard through the entire length of the opening credits, is not specified).Another younger brother, Jim O'Hara (1927–1992), played the seventh-billed role of Cal (the family surname is Fitzsimons, also rendered as FitzSimons).