According to Chapter 34, what was the ailment of the doctor's nephew, and why did his family decide to go to Shirdi?

As detailed in Chapter 34, the nephew of a doctor from Malegaon was afflicted with a bone-cyst, or Hadyavran, which is described as a most difficult and extraordinary malady. The family's decision to go to Shirdi was born out of complete desperation. The boy's uncle, a doctor himself, along with other physicians and surgeons, had tried all possible native and foreign treatments, and even surgery, but nothing provided relief. With all medical remedies exhausted and the child suffering immensely, the family heard about a great saint in Shirdi, Sai Baba, whose Udi was said to cure even incurable diseases. They decided to try this "last resort" in the hope that this spiritual path could avert the calamity.