A Long Dark Past
The triplets discovered that they were born to a single mother at the Long Island Jewish Hospital. After checking records, they also discovered that there was even a fourth infant who passed away in childbirth. So the triplets were actually supposed to be quadruplets.

Source: The Austin Chronicle
Then in 1995, New Yorker author Lawrence Wright was a pivotal part of the research. He exposed to the triplets and to the world the reason why the boys were separated at birth. That’s when Eddy, Bobby, and David found out that they were actually part of a secret scientific study.