Visiting the family villa at Auschwitz
Rainer Hoess's grandfather Rudolf Hoess (not to be confused with Nazi deputy leader Rudolf Hess) was the first commandant of Auschwitz concentration camp.
For the first time Rainer (in the red jacket) visits the family villa at the Auschwitz concentration camp where his father spent part of his childhood.
Hitler's Children is on BBC Two on Wednesday 23 May at 21:00 BST or afterwards on iPlayer (UK only) at the above link.