Bill, 75, grew up without knowing his biological father. Born through a love affair between his mother and an African-American GI stationed near Loughborough, Bill’s father went back to the States after the war and she never heard from him again. The only information Bill had about his father is the name written on his birth certificate. Now that his mother has died, Bill wants to find out if DNA analysis can tell him more about his ancestry and if he has any living relatives in the US.

Richard, 53, ^[5] was very close to his father. It came as a complete shock when someone contacted him after his father’s death, claiming to be his real dad. A DNA test shows Richard and his sister have different fathers, so Richard wonders if this person be his biological father. Richard hopes DNA testing will be able to solve this mystery and show if he has a half-brother, Brendon.

Leicester-born Janine, has lived her entire life never knowing the identity or ethnicity of her birth father. Her white-British mum died taking the secret of who Janine’s biological father was to her grave. Growing up with darker skin. Janine wants to know if DNA can help her to find out anything about her father’s heritage.

Adopted in Southport when she was only six months old, Margaret has never felt brave enough to find out anything about her ancestry. In particular, she would really like to find out about her birth mother and what happened to her all those years ago. Could she have other family out there who she's never met.

Northern Irish triplets, Peter, David and Phillip were adopted as young boys and while they knew about their biological mother who passed away some years ago, they've never known where their father comes from. They have ideas, but when Professor Turi King reveals what is hidden in their DNA, it changes everything they thought they knew about their ancestry.

Tink didn't find out she was a sperm donor child until she was 17 years old and pregnant with her first child. Tink would like to know what DNA can tell her about her biological father and if she has any half donor siblings. With 45,000 donor conceived people on the registers in the UK she will only be able to find a half brother or sister if they're looking for her as well.

Stacey is in Liverpool to meet 52 year-old Richard, who is on a life-long mission to discover the identity of his father. With his mum never revealing the truth while she was still alive, Richard has hit a number of dead ends researching on his own. When Professor Turi King and the team test his DNA, they deliver far more than Richard expects - and he’s blown away when finally learning the truth.

Sixty two year-old Janet has spent her life wondering if a rumour is true that she might have a secret sister. When her father returned as a British prisoner of war during World War Two, she had heard that he may have fathered a child while in Austria. She now wants to know if there is a half-sister on the continent looking for her as well...

Liverpool-born Maureen is wondering if her father was an African-American GI who fell in love with her mother during the Second World War - which could mean she has family in the US. She’s also curious why her three sons are so musically talented and if the secret may lie in her DNA.

Forty six year-old Mel only found out as a teenager that she was conceived using a sperm donor. Now she wants to see if she can find her biological father’s identity by decoding her DNA… and discovers far more than she ever expected.

When mother-of-six Fi looked into her adoption as an adult she made a horrific discovery: that her birth mum was murdered by her birth father, a few years after she was adopted. Fi now wonders if this man was really her biological father or if it might be someone else, which was rumoured at the time. She’s also concerned that, if this man is indeed her father, that she might have passed down a 'murder gene' to one of her six children.

Thirty eight year-old Clare was always told by her mum that Clare’s father was a British soldier stationed in Belfast during the Troubles. But she began to doubt her mum’s story when family friends believed it was another man… making Clare mixed race. Now Clare wants to solve the mystery of her father’s identity.

Leigh only discovered that he might have a secret sister after his mum passed away. He now wants to know if this is true and if so, whether she’s still alive.

Georgina was conceived during a holiday romance 34 years ago when her mum fell for a Portuguese waiter. She now wants to know if her father is still alive and, if so, let him know he has a daughter.

Matthew grew up in foster care never knowing where his father came from. He now wants to discover his ancestry and if he is actually Caribbean.

Stacey meets five sisters in Lancashire who only found each other as adults. They know they all share the same mum, but want to find out if they also have the same father.

Luke was a sperm donor as a university student in the late 1980s. He’s now come forward to find out if any potential children might be looking for him.