I am beginning to wonder if this is a possibility. There is alot of patricide going on : Kate & Wayne, Locke & his dad (although Sawyer did it for him), Ben and his Dad, Jack killed his Dad via career ruination, etc... . I know Jacob/Nemesis are the same age bracket, but you have to rely on island time jumping to explain that. The phrase 'you know how bad I want to kill you' seems to point to a relationship borne of more than mere aquaintanceship. I'm also going with the point that Jacob and Nemesis are NOT supernatural or at least they started off as human. What do you all everybody think?