Thanks for the response. As far as we know ,the son Francois Gustav , was born 1818 and lived in Bordeaux . We are not sure of his place of birth and where the parents who were Marie Ursula and father , Francois Gustav (we assume that he carried his father's name) were married. We presume it was in the same region. We understand that he had an adopted sister by the name of Marie de Coligny and that she moved to the USA and later retired and passed on in Algiers.