How Do You Define Personhood?

The definition of "personhood" is continually debated by philosophers, medical ethicists, and the public. Do you believe that patients in persistent vegetative states (PVS) and anencephalic infants are persons?
I believe that simply being alive and being human means one is a person. Therefore both are persons.
My definition of personhood is religiously grounded. I believe all human beings are created in the image of God and have a divine origin which confers personhood. Therefore both are.
I hold the view that personhood is relational. Therefore, if these patients are member of families or communities to whom they are important, then personhood is conferred upon them.
I believe that personhood is grounded in personal history and a collection of attributes, i.e., "personality," that mark an individual as unique. Therefore the PVS patient is a person, while the anencephalic infant is not.
I use consciousness or the possibility of a return to consciousness as the clinical benchmark of personhood. Therefore neither is a person.
I believe that to be a person one must be capable of rational thought and purposeful action and must have the ability to relate to others. Therefore neither is a person.