I have an idea of why we are short and why we are tall?

well to put this in simple and quick terms we are tall because of our genes and the nutrition we eat. well a boy is tall because of his mother and his father was short. the next son they have is medium. why because of his genes. see there height differs because of the number of cells they have to their length. to sum this i up we are tall because we have more cells deticated to our length then a person with short limbs. it is the opposite for short. the dna in the cells tell when to divide thus adding to their length or height as most people call it. all the cells in our body have genes to divide and grow. hair cells skin cells bone cells and brain cells. all the different cells in our body is responsible for height not just one or one specific gene why because we have so many different cells in our body. well this would prove my theory by showing how our brain heart and feet are bigger than a new born baby we have more cells. also to another thing to prove is hair, a person with long hair has more cells than a person with short hair. the long haired person has more cells thats why its longer than short hair. i think this is right but if their are any experts out there please evaluate my theory on how our height differs in society. please respond respectfully. warmest reguards steven.