Hi. I'm from Savannah but sometimes wind up having lunch or dinner in the Richmond Hill area with business associates. Of the places offering Southern Buffet-style meals available down that way, I can recommend Southern Image Restaurant on the south side of U.S. 17 just east of I-95 for pretty decent food.
I'm not normally much of a fan with respect to buffets in general, so I can't say that I've been to the Fairmount in the last 10-15 years, maybe longer. My mother used to like the place when she was still alive. I'm guessing your dad will enjoy either place. Good luck!