Even more scary: without any living relatives, there would be no way to identify himself with that degree of accuracy. Sure, you can disinter a corpse, but that's bureaucratically way more difficult than performing a DNA test on a live human, and assumes you know where your relatives are buried to begin with.
I wonder if that is at all possible. Could there be someone alive today who has no blood kin ( father, mother, siblings, uncles, aunts, cousins 1st, 2nd, etc )?
Not necessarily. Many who grows up in an orphanage has living relatives.
For example many who are in an orphanage has living parents, but the social services and the courts have decided to take them into care for their own safety.
Or footprints since some hospitals take footprints of newborns, but it's neither a given that they did, or that they're readily available, or that you can identify which hospital to ask, or even that the person you want to identify still has both feet.
