His mother was Aline Catherine Eugénie Boutroux who was a sister of Poincaré and so he was also related to the other men of great distinction in that family.
Kanyang ina ay Aline Catherine Eugénie Boutroux na noon ay isang kapatid na babae ng Poincaré at kaya siya rin ay may kaugnayan sa iba pang mga kalalakihan ng mga dakilang karangalan sa pamilya.