The power struggles within the dynasty have been violent, with Kim Jong-il's brother-in-law Jang Song-thaek, and Kim Jong-un's half-brother, Kim Jong-nam, having been killed by the regime by execution and assassination, respectively.
Is that part a lie? Why are they murdering one another's heirs and talking about successors to the dynasty?
Nepotism for sure. At least he stepped down.
In 2013, Clause 2 of Article 10 of the new edited Ten Principles for the Establishment of a Monolithic Ideological System adopted by the government, states that the Party and revolution must be carried "eternally" by the "Baekdu bloodline".
The fuck is that shit?
Here's his wikipedia page
NY Times obituary if you want an idea of how the West portrayed him
Another wiki page about Cambodian genocide denial including this banger:
On June 6, 1977, Noam Chomsky and Edward S. Herman published an article in The Nation which contrasted the views expressed in books by Barron and Paul, Ponchaud, and Porter and Hildebrand, and in articles and accounts by Butterfield, Bragg, Kahin, Cazaux, Shanberg, Tolgraven and others. Their conclusion was: "We do not pretend to know where the truth lies amidst these sharply conflicting assessments; rather, we again want to emphasize some crucial points. What filters through to the American public is a seriously distorted version of the evidence available, emphasizing alleged Khmer Rouge atrocities and downplaying or ignoring the crucial U.S. role, direct and indirect, in the torment that Cambodia has suffered."
His successor wasn't deigned by bloodline.