Longshot, I'm sure...but here goes:
I don't profess to know too much about I've Got a Secret and certainly don't know much about the many incarnations of such, but I was just randomly informed that my Grandfather's sister was apparently on the program sometime in the 50's or 60's.
Her name was Viola Hall from Jackson, MS. My father believes her secret was that she traveled to Europe, became a grandmother, and (something else) all in one year.
I've checked the few IGAS episode guides that I can find online but no success, at least on the surface. While finding the episode would be the ultimate gift for my father, at least if some of our resident GSN experts could tell me how much of that portion of the run has re-aired, it would be a good start.
Thanks in advance for your help!