What is the main conflict in Mule Bone by Zora Neale Hurston?

Mule Bone was written in 1930. It was a joint collaboration between noted African-American authors Zora Neale Hurston and Langston Hughes, who joined forces to write a play based on a folktale, "The Bone of Contention," that Hurston had discovered in her anthropological studies. Both writers conceived the play as representative of authentic black comedy. Shortly after the play's creation, however, Hurston copyrighted the play in her name only. The two authors had a falling out and did not speak to one another again. A legal battle ensued and, because of those legal issues, the play could not be produced during either writer's lifetime.