Episode 3

Triplets Peter, David and Phillip were adopted as young boys and have only been able to guess where their father comes fro, guessing such places as Italy or South America. When Professor Turi King analyses their DNA and finally uncovers the truth, it changes everything they thought they knew about themselves.

Tink only found out she was conceived from a sperm donor when she was 17 years old and pregnant with her first child. Since then, her relationship with the man she always believed was her father has never been the same. Tink would now like to learn about the other half of her ancestry and if she has any half donor siblings. But with 45,000 donor-conceived people in the UK, she will only be able to find a half brother or sister if they are looking for her as well.

Mitchell and Manuela fear their three-year-old son Leo is slowly going blind, and they are desperate to find a cure. If specialists discover Leo's sight loss is from a genetic mutation, he could be eligible for sight-saving gene therapy. If not, there is little that doctors can do, and he is likely to be completely blind by the time he is a teenager. The only way Mitchell and Manuela can find out is through a DNA test. But Leo's results are far from simple.