Marie-Hélène's paternal grandmother was Baroness Hélène de Rothschild (1863–1947), the first woman to take part in an international motor race and the daughter of Baron Salomon James de Rothschild.
Baroness Hélène de Rothschild, Marie-Hélène's paternal grandmother, was the first woman to compete in an international motor race and the daughter of Baron Salomon James de Rothschild. She lived from 1863 to 1947.