Nice post Keenu 😊
My speculation:
Ishwar is not happy with his second marriage, not happy with his kids, they disrespect him, his second wife is busy with other things, has no time for him. He is feeling lonely. This is going on for a while. He starts remembering BM and his kids in India and longs for their company. So he starts writing letters, calling them, but the arrogant air is still there. He looks to come back, but no one is ready to accept him. He then realizes that he has lost the respect of his kids in India, he cannot be accepted by his wife, he decides not to return and continues living an incomplete lonely life in the US.
But I think this way the track will end soon, and this may not happen..