context: In late 1947, he married Olga Naumova (1901–1978), Natalie's niece.
source: Naumova had lived with the couple and acted as their secretary for 18 years.
reference_original: Наумова жила с парой и была их секретарем в течение 18 лет.
reference_flipped: Наумов жил с парой и был их секретарем в течение 18 лет.