Using that information, I found obituaries on Joseph & Octavia (Josephine Octavia Carlin Richaud). They're attached. His doesn't list his burial place, but she's buried in Hope Mausoleum in New Orleans.

You can order their death certificates, which may include information on their parents if the informant knew it. Order them from the state archives using this information:

Joseph Richaud
1943 Orleans Parish Death Records
Page: 4133 Volume: 219

Josephine Octavia Richaud
1950 Orleans Parish Death Records
Page: 7094 Volume: 0