If the jabbed are GMOs, can they still legally own property? When do their wills kick in? Did the original person "die" when they became a transhuman? What if we are all modified and nanotech'd up the wazoo, what then? Who adjudicates all this? What is the relevant law?

My neighbour has a car, and he doesnt know a lot about cars, so he asked me to check his car. I changed his car by building something in his car, so I can hack his car, and now his car is mine. Hmm? What would the judge tell me?
A) thats all oke: his car (his body) is yours.
B) Who the f*ck do you think you are?