In this case, the stepchildren have no obligation to support their stepparents. If step-children live with step-parents and step-parents educate them, the relationship between them is equivalent to that between biological parents and children. In this case, the stepchildren have the obligation to support their stepparents. According to the law, stepchildren raised by stepparents have the obligation to support their stepparents; Children's obligation to support their parents will not be terminated because of changes in their parents' marriage. Therefore, even if children have supported their stepparents, they still have the obligation to support their biological parents.