David Adler was born fourth of six children of the married couple Benedikt (Baruch) and Karoline (Kela) Adler, née Adler.
Younger brother Jakob, six years in his minor was killed at the age of thirty-three in World War I on April 20, 1917. He is buried on the war cemetery in Sissonne / France.
David Adler lived in Dortmund in the Oesterholzstraße 80. He was married to Friederike (Frieda), née Blumenthal. After David Adler had to do forced labor from 1940 to 1942 (he was sixty-two – sixty-four at that time) he and his wife were deported to Theresienstadt July 30, 1942. From there they were deported to Auschwitz on May 15, 1944. For both of them a declaration of death exists dated May 8, 1945 (age sixty-six).
Both sons Egon und Manfred Adler (born 1913 and 1918) succeeded in emigrating to the U.S.