I have extensive genealogies of Duchamp de Chastaigne and allied families in France,Martinique and Louisiana. My great-grandmother, Marie Mathilde Duchamp de Chastaigne was born in St. Martin Parish in 1864. I also have the complete Sandoz genealogy which dates back to 1450 in Dombresson, Neuchatel, Switzerland. I also have the lesser known Duchamp de Chastaigne/ Theaux lines. If anyone is interested, please let me know. Thank You.