It was the Advent season, a time of year when families would gather together to celebrate and spend time with one another. For the Wilsons, this annual tradition took on a more taboo twist, as incestuous desire simmered beneath the surface of holiday cheer. Colleen Wilson, a 38-year-old divorcee, had recently moved to a new suburban house with her two children, Felix and Fleur. Felix, a strapping 22-year-old with chestnut...