Legal analysis: stepchildren raised by stepparents have the obligation to support their stepparents. If stepparents take care of, support and educate their stepchildren, stepchildren should support their stepparents. If they fail to fulfill this obligation, they can't support them.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 111 The provisions of this Law on the relationship between parents and adopted children shall apply to the relationship of rights and obligations between adoptive parents and adopted children from the date when the adoption relationship is established. The provisions of this law on the relationship between children and their parents' close relatives shall apply to the relationship between adopted children and their parents. The relationship of rights and obligations between adopted children and biological parents and other close relatives is destroyed by the establishment of adoption relationship.

Article 118 After the dissolution of the adoptive relationship, the adult adopted children raised by the adoptive parents shall pay living expenses to the adoptive parents who lack the ability to work and have no source of income. If the adoptive relationship is dissolved because the adopted child maltreats or abandons the adoptive parents as an adult, the adoptive parents may ask the adopted child to compensate for the alimony paid during the adoption period. If the biological parents ask for the dissolution of the adoption relationship, the adoptive parents may ask the biological parents to compensate the alimony paid during the adoption period; However, unless the adoptive relationship is terminated because the adoptive parents abuse or abandon the adopted child.