Who is Bill Bob from The River Why and what is their importance?

Although he is Gus's younger brother, Bill Bob has an "old soul" mentality and presence about him. In fact, one of the people that helps to form Gus's views on the world is Bill Bob, through his interpretation of the world and afterlife. Bill Bob wants to have nothing to do with fishing and hates water as well. For this reason, he sticks out in the Orviston family. However, because he has no emotions and is so independent, he is the apple of Ma's eye.