Can you narrate the story of the doctor's nephew from Malegaon and how he was cured?

Certainly. Chapter 34 of the Shri Sai Satcharitra recounts the story of a doctor from Malegaon whose nephew suffered from a severe bone-cyst, referred to as Hadyavarn. Despite the uncle being a physician and trying all available native and foreign treatments, including surgery, the boy's condition did not improve and he was in great pain. When all medical efforts were exhausted, the family heard of Sai Baba of Shirdi. They traveled to meet him and, with pitiful faces, pleaded for his help. Sai, the embodiment of compassion, reassured them and gave them Udi, instructing them to apply it to the wound. This story is presented as a powerful illustration of the Udi's miraculous healing properties when conventional remedies fail.