Watch Secrets of the Fathers

Donor-conceived children battle a secret system in the search for their biological fathers. ABC's Four Corners reveals the story of two twins who spent 20 years trying to crack the mystery of their father's identity. Their story calls into question the confidentiality that still "protects" many sperm donors from being found years later by their offspring.

Secrets of the Fathers is a 2005 documentary with a runtime of 44 minutes.