Firmin married Marie Josepha Theriot 15 Feb 1790, Donaldsonville, Ascension, Louisiana, United States. Marie (daughter of Jean Jacques Theriot and Marguerite Josephe Richard) was born 15 Jun 1770, Saint-Servan, Ille-et-Vilaine, Bretagne, France; was christened 15 Jun 1770, Saint-Servan, Ille-et-Vilaine, Bretagne, France; died 14 Dec 1822, Ascension, Louisiana, United States. [Group Sheet]

1. Maria Rosa Dupuis was born 25 Feb 1793, Donaldsonville, Ascension, Louisiana, United States; was christened 7 May 1794, Ascension of Our Lord Catholic Church, Donaldsonville, Ascension, Louisiana, United States; died After 1850.