 Complete the following phrase:  Upon returning to Poland, Sobolewicz was reunited with his mother, who survived five years in Ravensbrück, and with his younger brother, who fought in the Polish Home Army Armia Krajowa, or AK, the main Polish resistance organization. But he had to endure the loss of his father, who was gassed in Birkenau on 20 June 1942, his grandfather, who was shot dead by SS henchmen for helping Jewish friends, his cousin, who was murdered in the 