In Amazing Spider-Man #578 we got "the" Shocker, followed by "a" shocker in the form of an elderly gent who introduced himself to Spidey as J. Jonah Jameson...senior. But wait, haven't we already met Jonah's drunken, abusive father? Spider-Man's Tangled Web #20 presented us with "Behind the Mustache" a neat little one-shot tale by Zeb Wells and Dean Haspiel, focusing on the past of Jolly Jonah Jameson:
The story finds Jonah very reluctantly attending therapy at the Daily Bugle's insistence. Under hypnosis, he finally reveals that his father was an abusive ex-military man named David Jameson.
Of course, all of this is suspect, since Jonah, a biased source at best, clearly does not want to talk to the psychiatrist at all, and is fighting the doctor every step of the way. "David Jameson" may just be a fiction he carries around with him to explain away his obnoxiousness to various bleeding hearts and do-gooders he encounters in life...
Later, Jonah tells the therapist how he met his first wife Joan and picked up his lifelong cigar habit:
I'm not even gonna speculate how this fits in with what Mark Waid has in mind for JJJ Sr., since we'll find out soon enough. Waid has said that he is aware of "Behind the Mustache", and intends to weave it into into his plans for Jonah Sr. I just thought it might be fun to give you all a glimpse at the other J. Jonah Jameson's dad before we get to know J. Jonah Jameson Senior.