I know it's been several years since you posted the message looking for descendants of Beauford Allen but I just stumbled across it. I recently re-discovered a piece my grandfather had written about Beauford Allen and the mountain home where he was killed. My grandfather was Jack Allen and James Beauford Allen was his grandfather, so I guess he would be my great-grandfather. Jack was born in Neosho, MO in 1921 and he passed away in March of 1998.
I don't have a lot of information here with me but I believe Jack's father was named Clarence Elmer Allen.
My mother, Jackie Allen, is Jack's oldest daughter.
If your account is still active I can try to uncover some more information for you.
By the way, my mother was born in Joplin, MO and now lives in Fort Smith, Arkansas, where I was born and still live. Or, if you'd like a copy of the piece written by Jack Allen I can send it to you as well.I have a printout of it but I just typed it all into Microsoft Word.