Benjamin Soup (also known as Benno) was arrested during a raid in Amsterdam. He was sent to Mauthausen where he died.
His parents (his father was a member of the Jewish Council) and other family members survived the war.
Ina Soep and Jacob Polak, Steal a pencil for me. Love letters from camp Bergen-Belsen and Westerbork (2000)
For a biographical note see: H.E. Dominicus, Mauthausen. Een gedenkbo…