Marie's grandchildren are still alive and could presumably be genetically tested to see their heritage if there was any real question. https://en.wikipedia.org

Marie's grandchildren are still alive and could presumably be genetically tested to see their heritage if there was any real question. https://en.wikipedia.org/wiki/H%C3%A9l%C3%A8ne_Langevin-Joliot https://en.wikipedia.org/wiki/H%C3%A9l%C3%A8ne_Langevin-Joli...