They moved over the curving top of the hill and saw the Joad place below them. And Joad stopped. “It ain’t the same,” he said. “Looka that house. Somepin’s happened. They ain’t nobody there.” The two stood and stared at the little cluster of buildings.
in chapter 4 we met jim casey who used to be a preacher and joads preacher he baptized him in the ditch. we learn that joad was a menace in his childhood. and they walk together to joads family hous and when they pull up nobody's there.