Why is it that Yao Ming turned out so tall? PLS answer.!?

Why is it that Yao Ming turned out so tall even though that his dad was 6 ft 7 and his mom is 6 ft 3? Also what height will I be? I'm 13 years old 5 ft 5 . My father is 5 ft 5 and my mother is 5 ft 4.
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