Judge Rinder made a devastating discovery that left him lost for words while visiting the Nazi death camp where his grandfather was held.
After being sent to a series of camps, Roberts's grandad Morris Malenicky was taken to Schlieben concentration camp in Germany, where he was forced to work producing missiles for the German army.
Conditions were appalling for the 2,000 Jewish prisoners like teenage Morris, who was born in Piotrkow, Poland, that were living there with little food or protection against the sub-zero conditions.
While tracing his Jewish family’s tragic past for the BBC’s Who Do You Think You Are?, Robert is left in tears while reuniting with his grandfather's friend and fellow Holocaust survivor Sir Ben Helfgott at the ruins
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