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A lesser-known movie called Twice Blessed ( http://www.tcm.com/tcmdb/title.jsp?stid=94122 ) came out before this book, and has a similar, if not identical plot (twin sisters are separated as children, but reunited as teens and secretly switch places, bringing their estranged parents together). I would like to research more about this; perhaps the writer was influenced by watching this movie? Or there is another story pre-existing both of these with twin sisters switching their identities and bringing the parents back together ( I choose these points carefully because "the prince and the pauper" has a similar twin switching, but the estranged-parent element is the mutation that has become prevalent through this movie, the book, and the two Disney remakes, making the origin of this mutation the point of interest)
Three Smart Girls, I suppose? Not sure whether it involves any twins, but otherwise the plot seems to be similar, and it is, together with this novel, listed as a basis to The Parent Trap; and at 1936, it predates both the novel and Twice Blessed! --220.127.116.11 (talk) 19:50, 20 March 2011 (UTC)
In the French-English crime drama "The Tunnel" [], in season 2 episode 6, French Detective Elise Wassermann (Clémence Poésy) receives a package. Inside is a book titled ‘Deux pour une‘, one of the French versions of this story. I would like to see this (and other) reference included in the article. Jopower (talk) 11:30, 26 July 2017 (UTC)