Decline of Clans, Varn-Sankar, and Varna System: Geeta, Chapter 1, Shlok 39, 40, and 41

Learn the meaning of the Verses 30, 40, and 41of Bhagwadgeeta, Chapter 1. Also learn How does VarnaSankar happen? Which of your kinsmen are the real ones? What does decline of Great Clans mean? Who can’t be the part of any Varnashrama? What is essential for any Varna?