Apologies if this question has already been posed, not RTFT, but I'd be grateful for a pro-life person's thoughts.
A woman gives birth to two conjoined twins, Mary and Jodie. The twins are linked at the pelvis with fused spines and spinal cords, and with four legs.
Jodie, the healthier of the two, has an anatomically normal brain, heart, lungs, and liver. She shares a common bladder and a common aorta with Mary. Mary is severely abnormal in three aspects: brain, heart, and lungs. She has a very poor “primitive” brain. Her heart is vastly enlarged, very dilated, and poorly functioning. There is a virtual absence of functional lung tissue. Mary is not capable of independent survival. She lives on borrowed time, all of which is borrowed from Jodie.
If they remain conjoined, the prognosis is that neither will survive infancy. If separated, Mary will die but Jodie has good prospects of living a full life.
Does Mary have a right to life (a life sustained by Jodie's organs), even if that life will be fleeting and also cause the extremely premature death of her sister?