Who is Carl Taft from Taft and what is their importance?

Carl Taft is Fay's younger brother. He was a championship wrestler before his father died suddenly. As John envisions ,Carl was in the room when his father died. At the beginning of the novel, Carl and his family have recently moved to Memphis from Coalfield. Carl, unable to hold down a job or stay in school, has become an addict. He maintains his composure while high, until one night he nearly OD's and is attended by Fay and John Nickel.