Kim Yo-jong
Kim Jong-un is the second of three children Ko Yong-hui bore to Kim Jong-il; his elder brother Kim Jong-chul was born in 1981, while his younger sister, Kim Yo-jong, is believed to have been born in 1987. He is a grandson of Kim Il-sung, who was the founder of and led North Korea from its establishment in 1948 until his death in 1994.