Balding's well-documented aristocratic lineage on her mother's side can be seen in records that TheGenealogist has identified in research. Researchers found Balding's maternal line reveals that she is the great-granddaughter of Sir Malcolm Bullock whose sexuality was investigated in her episode of the "Who Do You Think You Are?" programme first broadcast in July 2017. Balding's paternal grandfather Gerald Barnard Balding Sr, was a 10-goal polo player who travelled to play polo in America in the 1920s when he was in his 20s. Outbound passenger lists on a genealogy website include Balding's grandfather and it was at this time that Gerald Balding Sr met and later married the American heiress, Eleanor Hoagland.