This is quite a prominent family, and should not be too hard to locate descendants.
I've got too much on my own plate to be of any service in tracking down the 32nd GA flag. I would go to Ancestry.com, go to the "forums" section, and post on the Effingham Co. GA forum, whatever county Opelika is in, and the Harrison family forum. I would title each "George Paul Harrison", and indicate what you are looking for. I'm having pretty good luck doing this when I need info. on various individuals.
I was hoping to spend the next two Saturdays at the UGA library, but they had a fire on the 2nd floor last week (arson), keeping the entire library shut down until mid August.
"While My Guitar Gently Weeps" would be appropriate.