Can you tell me the story from the Satcharitra about the doctor from Malegaon and his sick nephew?

Certainly. In Malegaon, Nashik district, there was a degree-holding doctor whose nephew suffered from a severe bone-cyst, also known as Hadyavarn. As detailed in Chapter 34, the doctor himself, along with his physician friends and expert surgeons, tried all sorts of native and foreign treatments, but nothing worked and they felt helpless. The young nephew was in great pain. Hearing about the famous saint Sai Baba in Shirdi, the boy's parents decided to go there as a last resort. They believed that if this great 'Avaliya' applied Udi with his own hand, even an incurable disease like their son's could be cured. They traveled to Shirdi to seek Baba's help.