Hi - I'm looking for help to find info on my creole/mulatto GGM Edna Kirby/Curvin/Kervin (B: 1904/D: 1985?)

Here's what I know:
She had two children
- Myrtle Kinner/Kenner (Jones) (B: 1924/D: 1974); this is my GM, she lived in Ferriday & Clayton, LA
- Allen Kinner/Kenner (B: 1925/D: ?); possibly resides in Tennessee

GM Myrtle's death certificate shows mother as "Edna Kirby" and father as "Joe Kenner".
Family says Edna was a Curvin/Kervin. Joe is noted as deceased--according to family he was white/creole. Nothing else on "Joe." Negative search for Myrtle's LA birth record.

1930 Census has a Edna "Curren" listed with 2 children Myrtle & Allen "Menidoy"--this is the only census record I can find that is a possible family match. Found a possible death rcd match for a Edna Kirby in Buras, LA in 1985--I have nothing to validate this is her.

I have really hit a wall--appreciate it if anyone can assist with search/leads/connections.
Peace&Blessings