Who was the Parsi merchant Ratanji, and what was the source of his deep unhappiness despite his wealth?

Ratanji was a famous, very religious, and popular Parsi merchant from Nizam's state who possessed vast wealth, including property, carriages, horses, and farms. As described in Chapter 14, he was incredibly generous, and no one ever left his mansions disappointed. However, despite this outward appearance of swimming in an 'ocean of joy,' he was tormented by a difficult inner worry. The source of his profound sadness was that he was childless in terms of a male heir. He had twelve daughters, but the lack of a son made his immense wealth feel 'entirely fruitless,' and his mind was never at peace.