According to Chapter 16The Dusky Devastators Of The Depression told Bud to sit down in the chair because they gave him an instruments case to put his things and they gave him a recorder.
According To Chapter 18Mr Calloway was picking up rocks but he couldn't because his belly is in the way so Bud pick it up for him and saw that it had carving like his and Bud showed him the rocks. They found out that Mr Calloway is his grandfather.
According to Chapter 19Mr Calloway went to his room and started crying because he didn't knew that he had a grandson. And didn't know that her daughter died. So Miss Thomas went to his room and talk to him. Then the band gave him a old sax.