There seems to be little love lost between Kim Jong-un and Kim Jong-nam, the North Korean heir's half-brother. Kim Jong-nam, the eldest son of Kim Jong-il, says his younger brother will fail. A book due out in Japan this week writes that Kim Jong-nam “sees his brother failing. He thinks he [Kim Jong-un] has a lack of experience, he's too young, and he didn't have enough time to be groomed.” Kim Jong-nam lives in exile in China and Macau. He enraged his father a decade ago when he got caught trying to sneak into Japan in order to visit Disneyland—though he says in the new book that he was exiled for speaking out against the country's military-first policy.