Legal analysis: there is an obligation to support. According to the relevant regulations, the rights and obligations between adoptive parents and adopted children shall be governed by the provisions of this law on the relationship between parents and children from the date of the establishment of the adoption relationship; 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.

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

Article 1067 If parents fail to perform their maintenance obligations, minor children or adult children who cannot live independently shall have the right to ask their parents to pay alimony. Adult children who fail to perform their maintenance obligations lack the ability to work or are born.

Parents living in difficulties have the right to ask their adult children to pay alimony.

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.