Also, classification is hard when you get into the family and subfamilies. It's unclear when exactly all extant great apes diverged from each other. We know now from the genome that humans are closer to chimpanzees, then gorillas, and least related to orangutans. The new fossils that have been discovered in the past decade garble the family section of the code, as well as the genus portion of the human line.
What is the possibility that the great apes are not related but because it is such a successful model that very different species are converging rather than diverging from a common ancestor?