Margaret Dunbar Cutright starts looking into her grandfather's disappearance.

Jake Halpern tells the mothers' sides of the story. At 69, Kay McDonald had to cope not only with the news that her daughter wasn't her own, but that another mother had known the whole time.

Thanksgiving 2002, the Ohm family's dinner conversation turned to the recent terrorist attacks. Alexis Ohm, the youngest daughter, made a comment that in retrospect she admits was probably the wrong thing to say with her conservative, military-veteran dad at the table...that Osama bin Laden was hot.

When David Ellis Dickerson was 12, he got a new bike, and his father decided to use the occasion to teach David a lesson. But the lesson David learned wasn't the one his father intended.

Margaret meets the living relatives of her grandfather's kidnapper and finally arrives at an incontrovertible truth.

Sara was raised in a fancy suburban neighborhood with strict parents who liked to flaunt their wealth—with his and hers Porsches, for instance. But when Sara was 12, her mother and father sat her down in the den with her siblings, and told them that their father had done a terrible thing, and their lives were about to change forever.

Veronica Chater's mother wants to go to a resort in Mexico with a friend. Her father, a former cop with an extravagant sense of security, prepares as if she's headed for a war zone.

Writer Doug McGray tells the story of a daughter who wanted to be closer to her mom, and went to extremes to do it. Doug McGray is a fellow at the New America Foundation.

Host Ira Glass introduces four characters: Kay McDonald, who raised a daughter named Sue, and Mary Miller, who raised a daughter named Marti. In 1994, Mary Miller wrote letters to Sue and Marti, confessing the secret she'd kept for 43 years: The daughters had been switched at birth and raised by the wrong families.