In the series The Mortal Instruments by Cassandra Clare, Jace Wayland and Clary Fray fall in love before their father tells them that they are brother and sister.
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In the Dollanganger series by V. C. Andrews, Christopher and Corrine, the parents of the main character Cathy and her three siblings, are revealed to have been half-uncle and niece, but never learn that they are also half-brother and sister.
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Moll Flanders unknowingly marries her half-brother, and has children by him.
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