What actually constitutes a “cyb” or a “demi” in Adiamante?

Despite various claims to the contrary, effectively demis can only be born on old earth, and generally, but not exclusively, to demis, as result of earlier genetic engineering. Such genetic modifications largely postdated the flight of the cybs. Because of genetic regressions and other quirks, not all children of demis are demis, and the offspring of those who are draffs [normals]could have offspring with demi characteristics. Such offspring, or even the children of demis, do not have to become demis, but if they do not, then they must abide by the restrictions — or lack of privileges — accorded draffs.