Did you ever hear that the father of your James Allen might have been an older man? Maybe born about 1877? My Grandmother's brother James C. Allen was a disgraced man and I know nearly all about him. If this is a possiblity, please contact me at firstname.lastname@example.org. I will be happy to help you sort through what I know.
May I add, from my perspective, James C. Allen was a sensitive, goodperson who got caught in a web of lies and politics, not of his making.
Of course, this may not even be close to your answer to this secretive puzzle.