Based on the provided text, what personal adversity did Damu Anna overcome with Sai Baba's help?

The introductory part of Damu Anna's story in Chapter 25 highlights a significant personal adversity he faced. Although he was a wealthy man from Ahmednagar and had two wives, he was afflicted with childlessness. This personal suffering was resolved through the grace and divine intervention of Sai Baba. The text explicitly states, "By receiving Sai's blessings, he was blessed with sons." This miracle is presented as a key part of his background to establish the depth of his faith and the power of Sai's compassion, even before the main story of the cotton trade is told. This account from Chapter 25 serves as an example of how Sai grants the desired objects and removes the suffering of his devotees.