This question involved many complicated plots and situations. It required more specific background to give an accurate answer. However, in general, the cost of college was usually paid by the biological father or stepfather, depending on the specific situation and agreement. If the biological father is willing to pay for college, then they can fulfill their obligations. But if the stepfather also provides support, then this support can also be seen as a contribution and return. In addition, other factors such as family financial status, agreements, and legal provisions needed to be considered. It is best to consult a lawyer or family counselor to ensure that your rights are protected.