Her father was John Lighton Synge, a mathematician who has a biography in this archive, while her mother, Eleanor Mabel Allen Synge, also had some training as a mathematician.
Ang kanyang ama ay John Lighton Synge, isang dalub-agbilang na may isang buhay na ito sa archive, habang ang kanyang ina, Eleanor Mabel Allen Synge, nagkaroon din ng ilang pagsasanay bilang isang dalub-agbilang.