I did a quick search and found two cemeteries in the Jennings area. Is Bethany Cemetery the one you found? Between Highways 412 and 64?
You can contact the county clerk's office and ask them who owns or manages that cemetery. In rural areas, quite often a family would donate a few acres of their land for a cemetery; the donor's descendants may have the cemetery map, or know where it is.
While you're at it, get the names of the local morticians, especially those that have been around a while. Make sure you ask about any funeral homes that have closed down. Funeral homes are usually family-run; even if the elders have died and the funeral home has been shut down, there may still be records.
And don't neglect the funeral homes that seem to cater to different ethnic groups. My mother's triplet sister, who was still-born, was buried by a Hispanic funeral home in San Antonio.
I've had great luck with getting information out of funeral homes, and from old retired funeral directors. They love to talk about the old days.
And check with any old preachers in the area ... many of them kept detailed records of the people they married, baptized, and buried.
Maybe you and the jedis should get into genealogy ... it's a great way to learn history!
I don't remember the name of it, though I could drive right to it.
Hmmm...it would be nice to find out where they're exactly buried. I intend to put markers out there eventually anyways. Steve knows if anything should (God forbid) happen to me, he's to bury me there.