Ethical Analysis of the Conjoined Twins Dilemma

To analyze this case, we must understand the facts and the core ethical conflict, setting aside the legal question of who had the right to decide.

• Medical Reality: Jodie and Mary shared a single heart and lungs, a condition fatal for both.
• Two Options: 1) Do nothing, and both die within months. 2) Operate to separate them, saving Jodie but causing Mary’s immediate death.
• Parental Position: The parents, devout Catholics, refused the operation, believing it wrong to hasten Mary’s death and wishing to let “nature take its course.”
• Outcome: A court intervened, the operation was performed against the parents’ wishes; Jodie lived, and Mary died.

The central ethical question is: What was the morally right action? Was it right to operate to save one life, knowing it would directly cause another’s death? Let’s examine this through three philosophical lenses.

Immanuel Kant’s ethical framework is deontological, based on duty and rules, not consequences. For a Kantian, an action’s morality lies in the act itself, not its outcome.

The Categorical Imperative

Kant’s core principle is the Categorical Imperative. For a deeper understanding, the Stanford Encyclopedia of Philosophy offers a comprehensive overview of his moral philosophy.

• Universal Law: “Act only according to that maxim whereby you can at the same time will that it should become a universal law.” Could we will a universal law permitting killing one person to save another? A Kantian would say no. Such a law would make all lives insecure, undermining moral duty.
• The Formula of Humanity: “Act in such a way that you treat humanity… always at the same time as an end and never merely as a means.” This is the crux of the Kantian objection. The operation uses Mary as a mere means to an end. Her death is the tool used to save Jodie. Mary is not treated as a person with inherent worth, a profound violation of Kantian duty.

The Kantian Conclusion

From a strict Kantian view, the operation is morally wrong. The act of separation is an act of killing Mary. The intention to save Jodie cannot justify an inherently wrong action. The duty not to kill is absolute. Sacrificing one patient for another violates impartiality. This is a logical conclusion for an argumentative essay on this topic.

Divine Command Theory posits that an action’s moral status is determined by God’s commands. The parents’ position is a direct application of this framework.

Core Principles

• Goodness as God’s Will: The parents believed the right action was to submit to God’s will. Their statement, “If it’s God’s will that both our children should not survive, then so be it,” encapsulates this view. Goodness is obedience, not achieving the best outcome.
• Natural Law: Tied to Catholic theology, Natural Law theory holds that a moral order is inherent in the world. The parents’ plea to let “nature take its course” aligns with this. From this view, the surgical intervention is unnatural and immoral. The relationship between natural law and human rights is explored in a 2025 paper on the topic.
• Sanctity of Life: This principle holds that all human life is sacred. The act of separating the twins, knowingly causing Mary’s death, violates the commandment “Thou shalt not kill.”

The Divine Command Conclusion

A follower of Divine Command Theory would conclude the operation was morally wrong. The act is killing, which is forbidden. The correct moral path is to entrust the outcome to God and not actively end a life, regardless of the consequences. For help with such topics, see our ethics paper writing services.

Virtue ethics, rooted in Aristotle, focuses on the character of the moral agent. It asks: “What would a virtuous person do?”

Core Principles

• Telos and Eudaimonia: Telos is the purpose of a thing; for humans, this is eudaimonia—a flourishing life. Mary has no potential for eudaimonia; her existence is unsustainable. Jodie, however, has the potential for a full life.
• Virtue: Relevant virtues for the doctors include compassion, justice, and practical wisdom. A compassionate doctor is moved by suffering and the potential for life. A just doctor weighs the claims of both Jodie and Mary.
• Practical Wisdom (Phronesis): This is the virtue of finding the right action in a specific situation. It requires considering all details, not just rigidly applying a rule. This is where the Doctrine of Double Effect becomes a powerful tool.

The Doctrine of Double Effect

This doctrine distinguishes between intended and foreseen consequences. As analyzed in a 2022 paper on end-of-life decision making, the operation could be justified if the doctors’ primary intention was to save Jodie, and Mary’s death was a foreseen but unintended side effect. The act itself (separation) is not inherently evil. Mary’s death is caused by the removal of shared organs, not by an act intended to kill her.

The Virtue Ethics Conclusion

A virtue ethicist, using the Doctrine of Double Effect, could argue the operation was the most virtuous action. The goal was to promote human flourishing (eudaimonia), possible only for Jodie. The act was driven by compassion and guided by practical wisdom. The death of Mary, while tragic, was an accepted side effect of a virtuous act to preserve life.