He was raised by his grandparents from mother 's side .
Gurevich 's parents divorced when he was young ; he and his mother returned to her hometown Leningrad when he was 18 months old .
Gurevich was raised by Gurevich 's grandparents from mother 's side .
Gurevich 's parents divorced when he was young ; he and his mother returned to her hometown Leningrad when he was 18 months old .