Do parents have a responsibility to take care of their biological children. Or do they just have a responsibility to make sure their biological children are being taken care of (and it need not matter who does the actual taking care.)
To illustrate the difference, suppose a wife and husband are perfectly capable of producing healthy children together. However, the wife has a demanding career and would rather avoid pregnancy. So the couple finds another woman who is willing to be inseminated by the husband, and pays her some money in exchange for delivering the baby. When the baby is born, he is genetically the son of the surrogate mother, however he will be taken care by the wife.
Has the child been wronged, since his biological mother will not take of him? Or did the biological mother fulfill her obligation to her child (making sure he will be taken care of by someone, even if that person is not his biological mother?)