Legal analysis: 1. Children who have been given to others for raising since childhood can inherit the inheritance of their biological parents if they have not gone through the adoption registration in the civil affairs department.

2. The adopted children enjoy the inheritance right of adoptive parents from the date of the establishment of the adoption relationship, but they do not enjoy the inheritance right of biological parents, but the biological parents can inherit according to the will if they have a will.

3. If a stepchild supports both the adoptive parents and the biological parents, he can inherit the proper inheritance of the biological parents.

Legal basis: Civil Code of the People's Republic of China

Article 111 The provisions of this Law on the relationship between parents and children shall apply to the relationship of rights and obligations between adoptive parents and adopted 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 of rights and obligations between adopted children and their parents.

The relationship of rights and obligations between adopted children and biological parents and other close relatives is eliminated by the establishment of adoption relationship.

Article 123 After the beginning of inheritance, it shall be handled in accordance with legal inheritance; If there is a will, it shall be inherited or bequeathed according to the will; If there is a legacy support agreement, it shall be handled in accordance with the agreement.