Answer
Jigme Singye Wangchuck, the fourth king of Bhutan, had five children: four sons and one daughter. His eldest son, Jigme Khesar Namgyel Wangchuck, succeeded him as the fifth king in 2006. The other sons are Prince Jigyel Ugyen Wangchuck, Prince Jigme Dorji Wangchuck, and Prince Gyaltshab Jigme Dorji Wangchuck. His daughter is Princess Sonam Dechen Wangchuck.