Low's grandfather Maximilian Loewe emigrated from Hungary to England after the unsuccessful revolution of 1848. Through her father Walter, she was the niece of author Sir Sidney Low. Another uncle, Sir Maurice Low, was a journalist and Washington correspondent for British newspapers. She was a niece of Barbara Low, psychoanalyst, and through her aunt Edith, she was niece-in-law of David Eder. Through her son Misha, she was grandmother of Pavel Litvinov. Through her daughter Tatiana, she was grandmother of the reporter Masha Slonim, who married Robert Godfrey Phillimore, 3rd Baron Phillimore.