Who is inBOIL from Richard Brautigan's Trout Fishing in America ; the Pill Versus the Springhill Mine Disaster ; and, in Watermelon Sugar and what is their importance?

inBOIL is Old Charley's brother, He lives in iDEATH and appears in, In Watermelon Sugar. A heavy drinker, inBOIL eventually partners up with other drunkards, forms a gang, and turns a local factory into a whiskey distillery.