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Barbara Cherish kept the photograph that she had of her father hidden for over 30 years.
Barbara didn't know her father when she was growing up. He left her mother for another woman when she was nine months old.
She was only five when her father was executed after being found guilty of war crimes and crimes against humanity.
Barbara's father had been a leading member of Hitler's SS and the Kommandant at the notorious Nazi concentration camp, Auschwitz.
Barbara had been born in Germany but was adopted by an American family when she was 13.
She felt that she couldn't talk about her father's past to other people.
In 1989, Barbara's world fell apart when she was divorced from her husband and her beloved older sister died. This prompted her to find out more about her birth family and the father she'd never known.
Her research has now been published in a book called 'The Auschwitz Kommandant - a daughter's search for the father she never knew.'
Barbara told Outlook's Matthew Bannister that her father didn't want to be at Auschwitz and had been sent there as a punishment for leaving her mother.
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