Donor Unknown: "Hello, I'm Your Sister. Our father Is Donor
Clip: Season 13 Episode 2 | 3m 26s
When one girl discovered a unique online registry that connects donor-conceived children, she managed to track down a half-sister in New York. The New York Times picked up the story and, over time, 12 more half-siblings emerged across the United States.
Aired: 10/20/11
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