42-year-old adoptive mother married her adopted son.

Whether it is legal for an adoptive mother to marry an adopted son is as follows:

Lineal blood relatives or collateral blood relatives within three generations may not get married. Although there is no blood relationship between the adoptive mother and the adopted son, there is a similar lineal blood relationship in law, so marriage is not allowed. If the adopted son and the adopted mother insist on getting married, the marriage registration office will not accept their application for marriage registration because it violates the law.

Legal provisions on the relationship between adopted mother and adopted son:

1. Definition: adoptive mother and adopted son are not related by blood through legal procedures;

2. Rights and obligations: adoptive mothers and adopted sons have legal obligations and rights such as mutual support, education and inheritance;

3. Marriage restrictions: According to the laws of most countries and regions, adoptive mothers and adopted sons belong to immediate family members or have legal status similar to immediate family members, so marriage is prohibited;

4. Dissolution: In some cases, the relationship between the adopted son and the adopted mother can be dissolved after the adopted son reaches adulthood or through legal procedures, but even so, marriage may still be restricted by law.

To sum up, the marriage between an adoptive mother and an adopted son is regarded as an approximate lineal consanguinity in law, so it is illegal, and the marriage registration authority refuses to accept its application for marriage registration, so as to comply with the law prohibiting lineal consanguinity or collateral consanguinity within three generations from getting married.

Legal basis:

People's Republic of China (PRC) Civil Code

Article 1048

Lineal blood relatives or collateral blood relatives within three generations are prohibited from getting married.