A young woman is having special fun with her Uncle when her mom walks in on them. That's when the girl finds out that her mom and uncle used to have that kind of relationship too. In fact the young woman's younger sister was even fathered by her uncle. When her mom is done telling the story of the incestuous relationship she asks if her mom would be fine if her uncle got her pregnant. The mom asks why. The daughter has already been knocked up by her uncle.
