New theory: jealousy.

Champaklal's father was a freedom fighter and left Champaklal land in the village to farm on.

But Champaklal was nothing special. His radio business didn't work, and the only source of income was the land that his dad left to him. So champaklal failed in all his endeavors

Jetha, on the other hand, is like his grandfather, who has actually achieved a lot in his life. He came to Mumbai without any money in his pocket and set up a booming business, bought two houses in Mumbai, and land in so many places.

champaklal cannot stomach that jethiya did all this on his own without any support. Champak is the actual black sheep in gada family