They have a right to inheritance, therefore it follows that they also have the right to life.
As I understand it, they have other legal rights as well, including the right to be listed as a beneficiary on a health insurance policy.
Decades back, a Friend of mine (Mary) was pregnant with another friend of mine (Bridget) when Bridget needed some prenatal repair surgery and a blood transfusion. It was all handled, legally and financially, as Bridget's surgery. The records show tha preborn Bridget was the patient.