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Adoption is the legal process of establishing a legal parent-child relationship when the adopting parent is not the child's biological or birth parent. That means that once the adoption is final, the adoptive parents have all the legal rights and responsibilities of a parent-child relationship. That new parent-child relationship is permanent and is exactly the same as that of a birth family. An adoptive parent can be a stepparent or domestic partner of one of the birth parents, a relative of the child who has been caring for the child, or someone not related to the child by blood.
This excerpt is from the official California Courts website.