Eyes that Dreamt

Mahabharat forms the backbone of Indian culture. The story of a battle between cousins that changed the course of history. But did the enmity between the Kauravas and Pandavas ran only in one generation? Were Duryodhan and Yudhishthir the ones in bad terms with each other? Did Duryodhan's envy arise out of thin air?
Let's glance back in past- to the point where the seeds of dissent were sown in the Kuru dynasty. The seeds that bloomed into a tree and split the dynasty in two. Who were these seeds?