Question: Who is the maternal grandfather of Hélène Langevin-Joliot?
Sentence (from "Irène Joliot-Curie"): Irène Joliot-Curie (12 September 1897 – 17 March 1956) was a French scientist with Polish ancestry, the daughter of Marie Sklodowska Curie and Pierre Curie and the wife of Frédéric Joliot-Curie.
Relevant evidence: Yes