Who is XXX's sister?
Gabrielle-Charlotte Patin
Granddaughter of medical doctor and letter writer Guy Patin, daughter of medical doctor and numismatist Charles Patin and moralist writer Madeleine Patin, as well as sister of the writer and art critic Charlotte-Catherine Patin, Gabrielle-Charlotte Patin published a Latin work on Phoenician numismatics:
Charlotte-Catherine Patin