My grandfather was the biggest mass murderer in history

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He was the grandparent the family never talked about, until Kai discovered in a school lesson on the Holocaust that he was related to leading Nazi, Rudolph Hoss. After the second world war his grandfather had been put on trial and executed for his role in overseeing the murder of more than a million people in the gas chambers at Auschwitz. Kai was shocked and appalled by his grandfather's role and it affected him greatly, though eventually a religious path helped him. Kai had a difficult relationship with own his father, who as a young child lived within sight of the Auschwitz concentration camp, but was always reluctant to talk about it. Recently they have reconciled, after not speaking for over 30 years and took part in a documentary film called The Commandant’s Shadow which explores the lives of both the Hoss family at Auschwitz and survivors. Presenter: Jo Fidgen Producer : Julian Siddle Get in touch: [email protected] or WhatsApp +44 330 678 2707 (Photo: entrance gates and railway lines at Birkenau, Auschwitz Concentration Camp in Poland. Credit: Getty Images)