By 1942, Brady's parents had been separated from their children and sent to prisons and Nazi concentration camps, perishing in Auschwitz before the end of the Second World War.

For a short time, George and Hana stayed with an aunt and uncle; he was not Jewish, and thus the couple was a "privileged" mixed marriage and not subject to deportation.

The children were deported in May 1942[2] to Theresienstadt, a ghetto-camp not far from Prague, Czechoslovakia, where George shared Kinderheim L417 with around forty boys including Petr Ginz, Yehuda Bacon, and Kurt Kotouc.

[2] Brady traveled until May 1946 when he reached his aunt and uncle in Nové Město in Czechoslovakia and he learned from them that his parents had been murdered in Auschwitz.

[5] In 2016, he was supposed to receive an award for his lifelong campaign for Holocaust remembrance from Czech President Miloš Zeman on the state day of 28 October.