Section 633.223 - Effect of adoption1. Except as provided in subsection 3, a lawful adoption extinguishes the right of intestate succession of an adopted person from and through the adopted person's biological parents. The adopted person inherits from and through the adoptive parents in the same manner as a biological child inherits from and through the child's biological parents.2. Except as provided in subsection 3, a lawful adoption extinguishes the right of intestate succession of a biological parent from and through the parent's biological child who is adopted. The adoptive parents inherit from and through the adopted person in the same manner as biological parents inherit from and through the parents' biological child.3. An adoption of a person by the spouse or surviving spouse of a biological parent has no effect on the relationship for inheritance purposes between the adopted person and that biological parent or biological parent's heirs. An adoption of a person by the spouse or surviving spouse of a biological parent after the death of the other biological parent has no effect on the relationship for inheritance purposes between the adopted person and the deceased biological parent's heirs.4. A person inherits through an adopted person, an adoptive parent, or a biological parent of an adopted person only if the adopted person, adoptive parent, or biological parent of an adopted person would have inherited under subsection 1, 2, or 3.C66, 71, 73, 75, 77, 79, 81, § 633.223; 81 Acts, ch 194, §194 Acts, ch 1046, §29