Erich Karl Poppert was a son of Siegmund Poppert and Selma Rauner. He married in Zaandam on 2 August 1934 to Herta Speier, who toghether with their daughter Sonjs Selma have survived the Holocaust.
Erich Karl had another brother: Walter Michel Poppert, who also has been killed by the nazi's.
City Archive of Amsterdam, archive card of Erich Karl Poppert and Herta Speier..