The family to which humans (Homo) and Australopithecines belong; the family which includes both extinct and modern forms of man. Humanlike ancestors are split into four main groups: Australopithecus, Homo habilis, Homo erectus, and Homo sapiens. In most modern classifications, the Great Apes are included in the family. Hominids reached their greatest diversity about 2 million years ago with as many as five species present, including the oldest species of Homo, Homo habilis.