In my view, a person should have total autonomy with respect to his/her body, as well as what grows inside it. Whether the entity inside my body is a tumor, pheasant or person, that entity is my personal property by virtue of the fact that it is growing within my body. Only when the entity leaves my body does it become autonomous and no longer my property. Yes, looking at things through this prism, I was my mother's personal property for 9 months, analogous to a book or a shoe.
The problem with this approach is that it defines personhood entirely as a social construct. I reject the idea that killing a person is wrong only to the extent that they are part of social group. Killing a human is wrong simply because a human has a biology which makes him an intelligent being. It would still be wrong even if he was the last person alive and there was no social group to be a part of.
Jeremy