Ifyour friend's grand father was catholic his birth would be recorded in the New Orleans-Thibodeaux diosean registry archives. Write or call them and give name and age (birthdate).They charge $5.00 per lookup. You should then be able to find the great grandfather and GG mom's names and dates. If you have birthdatessend them to me and maybe I can help. If the grandfather was born before 1900 you might go to your local library and ask for Fr Hebert's record of Terrebonne and Lafourche parishes. You might find the frandfther there also.