Children's maintenance obligations are as follows:

1. Post-maintenance obligation arises after the adoption relationship between adoptive parents and adopted children is dissolved, which is the time characteristic of post-maintenance obligation and one of the formal characteristics that post-maintenance obligation is different from maintenance obligation;

2. The subject of post-support obligation is adult children raised by adoptive parents. An adopted child who is nominally adopted but does not actually live with the adoptive parents, or an adopted child who has been raised by the adoptive parents but has not yet reached adulthood, is not the subject of this obligation;

3. The object of post-support obligation is the adoptive parents who lack the ability to work and the source of life. There are two factors here, one is lack of ability to work, and the other is lack of source of livelihood. Both must be available at the same time, and neither of them constitutes the object of post-support obligation;

4. The content of post-maintenance obligation is to pay living expenses. This is the essential feature that post-maintenance obligation is different from maintenance obligation. After the dissolution of the adoption relationship, the post-adoption obligation arises, and the relationship between adoptive parents and adopted children no longer exists. Therefore, material support for the purpose of solving the survival problem-paying living expenses-has become a remarkable feature of post-support obligation.

To sum up, for legally adopted children, there is only the obligation to support adoptive parents, but there is no obligation to support biological parents. The state protects lawful adoption relations. The relationship of rights and obligations between adoptive parents and biological parents is destroyed by the establishment of adoption relationship. Your biological parents didn't support their children, so you have no obligation to support your biological parents.

Legal basis:

Article 1067 of the Civil Code of People's Republic of China (PRC)

If parents fail to perform their maintenance obligations, minor children or adult children who cannot live independently have the right to ask their parents to pay maintenance.

Parents who fail to perform their maintenance obligations, lack the ability to work or have difficulties in living have the right to claim alimony from their adult children.

Article 1068

Parents have the right and obligation to educate and protect their minor children. If a minor child causes damage to others, parents shall bear civil liability according to law.

Article 1069

Children should respect their parents' marital rights and may not interfere with their parents' divorce, remarriage and married life. Children's obligation to support their parents shall not be terminated by the change of their parents' marital relationship.

Article 1070

Parents and children have the right to inherit from each other.

Article 107 1

Children born out of wedlock enjoy the same rights as children born in wedlock, and no organization or individual may harm or discriminate against them.

The biological father or mother who does not directly raise children born out of wedlock shall bear the responsibility for raising minor children or adult children who cannot live independently.

Article 1072

There should be no abuse or discrimination between stepparents and stepchildren.

The provisions of this Law on the relationship between parents and children shall apply to the rights and obligations between a stepfather or stepmother and his stepchildren who are brought up and educated by him.