Maybe so, if you don't count supporting characters such as the Darling Family or Ernest T. Bass, & maybe Goober, or some of the various moonshiners. Most of the rest of them were just small town types.
Incidentally, the 4 musicians who played the Darling sons were a real Bluegrass band named the Dillards. I don't recall their first names except for Doug Dillard, the guitar player & lead singer.