Class III Malocclusion

Found a case study on Class III Malocclusion. It says Class III represents a very small portion of the total malocclusion, and it's most prevalent in Asian populations. Its etiology is generall believed to be genetic. Hmm, interesting. Both of my parents have perfect teeth and jaws. But, according to my mom, one of her brothers does have a bite problem. I barely ever see him so I don't know for sure.