Twins brothers, different parents after test tube mix-up

Wilma and Willem Stuart were a Dutch couple who had been unsuccessfully trying to conceive for years and decided to try IVF. They soon learned they would be parents of twins. When the two boys were born, Koen had blue eyes, dark hair and pink skin, Tuen had dark eyes dark hair and brown skin. A DNA test revealed that Koen was the Stuarts child but Tuen was not Willem’s. The report of the investigation has not been made public, but speculation is that a piece of lab equipment called a pipette, like a large eyedropper, had been used twice, causing another man’s sperm to be mixed with Willem’s. The hospital called it a “deeply regrettable mistake”. The Stuarts remembered there was a black couple in the waiting room the same day during the IVF process. The hospital located the man and confirmed he was Tuen’s biological father. Although he was under no obligation to meet his son he never knew he had, he did when Koen was 18 months old. The biological father only looked at him from a distance and didn’t try to claim him and was comfortable that the Stuarts loved the child, and let them continue raising him.