John Grzybowski was a son of Leszek Grzybowski, a pre war fighter pilot, who following the Polish Campaign ended up in the Soviet Union but fortunately survived. He later flew Mustangs in the PAF. There were few other sons of Polish pilots in the RAF, Michael Drybanski and Stefan Karwowski spring to my mind. Some were refused RAF service though, as having family behind the Iron Curtain.
Sqn Leader Wasilewski was Stanisław. He passed away in Argentina in 1988.