Repeat: Revealed: Jim Bob's sister Deanna (left) had Amy, 27, (center) with Terry (right) when they were 25 years old, but they didn't get married until 2006, 18 years after Amy's birth .
Revealed: Jim Bob's sister Deanna (left) had Amy, 27, (center) with Terry (right) when they were 25 years old, but they didn't get married until 2006, 18 years after Amy's birth .