(Chapter 29) How does the lawyer attempt to determine who the real brothers are? Does it work?

The lawyer, Levi Bell, manages to get all three men to write a line for him. He pulls out some old letters and examines the handwriting, only to discover that none of three men had written the letters to Peter Wilks. The real Harvey Wilks explains that his brother had transcribed all his letters because his handwriting is so poor. Unfortunately, since his brother has a broken arm, he cannot write and therefore they cannot prove their case.