Karel’s younger sister, Heda married Ludvik Hajek. Despite their own worries for their only daughter, the Hajeks bravely took in George and Hana when the children were left on their own when their parents were both arrested in 1941. Ludvik suffered for his marriage to a Jewish woman when he refused to divorce Heda, despite the Nazis’ urgings. Working in the forestry industry, Ludvik also lost his job as a result. Heda was deported to Terezin but managed to survive and remained there until the end of the war. When George returned at the end of the war, Ludvik and Heda welcomed him in to their home once again.