FYI: See last few posts here.
Hoot: also my Roan Mountain post above -

From what I gather, the brothers Hall were:
Roy Davis Hall (1907 – 1943)
Jay Hugh Hall (1910 – 1971)
James Faye Hall (1921 or 22 – 1984) aka Roy Hall (allmusic)

“There had been a third brother, named Roy Hall, who had played piano but had died in a car accident in 1943. It was a natural jump, especially as the name was open and he was filling the slot in the group, but James Faye Hall picked up the name Roy Hall himself after the trio quit, initially so that he could extend his string of popularity by association. Whatever the motivations, it stuck, and so did the success, to the degree that Hall was leading his own band, the Cohutta Mountain Boys.”