Who was the Parsi merchant Ratanji, and what was the primary cause of his deep-seated sorrow despite his vast wealth?

Ratanji was a very religious, popular, and wealthy Parsi merchant from Nizam's state, known for his immense property and generosity. However, as described in Chapter 14, he was constantly surrounded by an inner worry that made his life feel incomplete. While outwardly swimming in an ocean of joy, his great unhappiness stemmed from the fact that he had no son. He had twelve daughters, but the absence of a male heir to continue his lineage made him feel that his immense wealth and worldly happiness were entirely fruitless. This constant contemplation and worry over not having a son left his mind perpetually without peace.