I don't have any additional Hefner information for you but I wanted to tell you that your grandmother Alma (Oberdier) Hefner is a distant cousin of mine and so are you.
The maiden name of Alma's mother Rosa Oberdier was Rosa Stuckey; Rosa was the younger half-sister of my great-grandmother Elizabeth (Bachmann) Bower;Rosa and Elisabeth's mother was Barbara (Bachmann) Stuckey but Rosa and Elisabeth had different fathers.My ancestors lived in Hardin and Marion Counties, OH.
I just met Alma about 10 years ago and just about three weeks ago I sent her some information on her Swiss-German Bachmann ancestors.Had you heard anything about that and if not are you interested in learning of the information yourself.
How is your Grandma Alma doing, I know she just celebrated her 90th. birthday this year.