His father , Yao Zhiyuan , is 2.08 m or 6 ft 10 in tall ; his mother , Fengdi Fang , is 1.88 m or 6 ft 2 in tall . Yao is the only child of 6 ft 7 in ( 2.01 m ) Yao Zhiyuan and 6 ft 3 in ( 1.90 m ) Fang Fengdi , both of whom were former professional basketball players .