Podolia Governorate
His maternal grandfather, Andrei Frantzevich Piontkovsky, was a Polish nobleman who owned lands in the Podolia Governorate and married a local villager, Olga Terentievna (surname unknown) of Ukrainian origin. Oleg's mother, Maria Andreevna Berezovskaya (née Piontkovskaya), was a radiologist. She had a daughter Mirra from the previous marriage to Gugo Goldstern, a high-ranking Soviet functionary and intelligence officer killed in the line of duty.