Pelagie Garnier- France/Louisiana @ 1800

I'm searching any information on the following people:Pelagie Marguerite Garnier, who was born in France about 1780 or so.She married Pierre Charles Mourain in France (possibly Nantes).They had at least three children:Pierre Gustav Mourain (born about 1807), Victor Adolphe Mouran, and Adelina Pauline Mourain.I don't know whether or not Pierre and Pelagie Mourain ever emigrated to Louisiana, but all three of their children did.Pierre Gustav Mourain was married to Rosaline Demoulin (daughter of George and Justine Porche Demoulin of Beauvoir, Vendee, France)on June 16, 1838, in the Diocese of Baton Rouge, Victor was married to Clara Belzons (daughter of John and Rose Monchosse Belzons) on October 17, 1837, in the Diocese of Baton Rouge, and Adelina was married to Gustav Delarmarre, date unknown, in the Diocese of Baton Rouge, Pointe Coupee Parish, Louisiana.