Legal analysis: adopted children have the obligation to support adoptive parents, which is clearly stipulated by law. They are no different from their own children because they are adopted children. After the adoption relationship is established, the biological parents have no obligation to raise and educate their adopted children, and the corresponding adopted children have no obligation to support and assist their biological parents. Legally, it mainly depends on whether the adopted son and the biological parents have formed a relationship of upbringing and education. If an adopted son fails to pay alimony, he can ask for alimony through mediation by the relevant department or bring a lawsuit to the people's court. Of course, you can also protect your legitimate rights and interests in the following two ways: First, parents who are unable to work or have difficulties in life have the right to ask their children to pay alimony when they fail to fulfill their alimony obligations. Therefore, if it meets the legal requirements, you can bring a lawsuit to the court and ask the adopted daughter to pay alimony. Second, the relationship between the adopter and the adopted daughter has deteriorated, and it is really impossible to live together. You can terminate the adoption relationship with it by agreement. If no agreement can be reached, you can bring a lawsuit to the court; In addition, if the adoptive relationship is dissolved because the adopted child maltreats or abandons the adoptive parents as an adult, according to the provisions of this law, the adoptive parents may require the adopted child to compensate the living expenses and education expenses incurred during the adoption.

Legal basis: Article 23 of the Adoption Law of People's Republic of China (PRC), since the adoption relationship is established, the rights and obligations between adoptive parents and adopted children shall be governed by the provisions of the Law on the Relationship between Parents and Children; The rights and obligations between adopted children and close relatives of adoptive parents shall be governed by the provisions of the Law on the Relationship between Children and Close Relatives of 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.