Hi Bonnie: I am Roy Carroll Duplessis. My GGG Grandfather was a Casimer Duplessis b-1804 in Plaquemines Parish. I believe Martin's brother, Casmir b-1771 may have been his father. Do you have any info on wife and/or children of Casmir b-1771? I have nothing to verify that he is the father of Casimer b-1804.