Answer
Jigme Khesar Namgyel Wangchuck has four siblings: two sisters and two brothers. His sisters are Princess Chimi Yangzom Wangchuck and Princess Kesang Choden Wangchuck. His brothers are Prince Ugyen Dorji Wangchuck and Prince Jigyel Ugyen Wangchuck. All four of them are children of Jigme Singye Wangchuck, the fourth King of Bhutan, and his fourth wife, Jetsun Pema.