"Man's ancestors mated with Neanderthals and other related hominids during human evolution, according to a new study. This is further proof that Neanderthals were human beings. However it doesn’t stop there."
This link shows that there was also hybridization between modern humans Homo erectus and Homo habilis sowing these types to be human beings as well. This answers the question as to weather not they were human or not. That answer is yes.