The press had given him the nickname 'worm man,' but his friends knew him as Derek. Scientists had manipulated his DNA to mimic one of the most amazing features of the common worm: the ability to regenerate lost tissue. And it had worked. When they chopped off his hand to test him out, a new one had regrown within in a month.
Then it all went wrong. His body was slowly deteriorating. To save his life they had to transplant his brain into a new body. However, a major mistake during the operation severed his brain in two.
Fortunately, both halves fully regenerated and both were successfully transplanted into new bodies. The only problem was that both the men who now had one of the brains believe they were Derek. What is more, both had Derek's memories, mental skills, and personality. This created problems for Derek's girlfriend, who couldn't tell them apart. It also led to the Dereks getting entangled in a legal battle to claim Derek's assets. But which was the real Derek? They couldn't BOTH be him, could they?
oh...that makes a little bit more sense but if you think about it, wouldn't there be THREE Dereks, his hands makes a body, his two brains make two bodies...
What if they destroyed the hand. My post will assume this. They would have stopped it from growing once they realize it was. Both dereks are equally real, and that means that they are both half clones. The best soulution is to take both real halves and both clone halves and fuse them, making one clone and one real derek. Assuming this is not posible, I don't see anything wrong (except that it is a little wierd) for them to both share everything, live togather, or even marry the same person. Or they can seperate and make two different lives, although this will cause problems. Assuming they do seperate, and they are in fact equally "real," then the one whose body grew back first would be consdered more real. Assuming they both grew at the same time, then they would share all shareable things and divide the unshareable things. The Derek that moved out would give up the house, job , girlfriend, and get more cash.
Only one would have the memories and skills because of it being the left side which has those while the right side doesn't. The one with the right side of the brain would be like a child.