When was Sonam Dechan Wangchuck's half brother born?
Sonam Dechan Wangchuck:  She is the daughter of the 4th King of Bhutan Jigme Singye Wangchuck and half-sister of the 5th King, Jigme Khesar Namgyel Wangchuck. Jigme Khesar Namgyel Wangchuck: Jigme Khesar Namgyel Wangchuck (འཇིགས་མེད་གེ་སར་རྣམ་རྒྱལ་དབང་ཕྱུག་ , Wylie: "jigs med ge sar rnam rgyal dbang phyug" born 21 February 1980) is the current reigning Druk Gyalpo or "Dragon King" of the Kingdom of Bhutan.
21 February 1980