Brother, I know , everyone will tell you about 90% of the population, but you look at the studies of big research universities . In addition, stress is responsible for reducing growth hormone. In addition, many parents have shorter but longer children because there is more to it than just genetics. If you don't believe, look at Google. Is height really genetic ? Nor does the environment affect because in the 1500s, people in America were shorter for hundreds of years, but now people in America are 7-8 feet, but why ? Because genetics alone can never determine height.