what reasons does stephen kumalo have to go to johannesburg

Kumalo receives a letter from Theophilus, a minister in Johannesburg, who reports that his sister Gertrude is ill and requests that Kumalo come to the Sophiatown section of Johannesburg.

He received a letter informing him that his sister who had moved there was not well. He went to see what he could do for her. While there, he intended to try to find his brother and his son who also had gone to Johannesburg to live.