And you have a clinical definition of what a person is? I want to read it. Potential for life would be something I disagree with. I already regard it as alive due to its growth. Explain for me, please. Why do you consider that it is a double standard? I'm using the same logic for both- it does not matter. It is just a classification of what kind of creature it is. If it did become a parasite twin then that's just an example of a human not achieving a full growth. I already regard a growing fetus as a huma. As I said, I do not regard it as a "potential". I already see it there. In my view, the only thing that has a potential for human life would be the sperms and eggs. I disagree with abortion to the full. The only circumstances that I believe is okay for an abortion to take place is if the woman carrying the fetus would be in danger. I regard the fetus as a human, just at an earlier stage in its growth. I do not think that a fetus deserves to be killed because it would be an inconvenience its mother. If there is a possibility that the fetus grows up to be born, it should be protected. I do not regard a parasite twin the same way is it has diverged from the human growth cycle.