A married couple is unable to conceive on their own. The wife's younger single sister freely volunteers to donate a viable egg to the couple. What difficulty might Callahan have with this seemingly altruistic arrangement? This self-sacrifice is being directed to fulfill the desires of the adult parents. not of the child who will be born. A member of the extended family should not feel obligated to fill the role nature has designated for a biological parent. The younger sister is not married therefore, this violates the moral principle that only heterosexual married couples should conceive a child O No financial responsibility is being taken for the inevitable discomfort from invasive procedures or powerful drugs the donor will need to receive