(A) After the final decree of adoption is entered, the relationship of parent and child and all the rights, duties, and other legal consequences of the natural relationship of parent and child exist between the adoptee, the adoptive parent, and the kindred of the adoptive parent.

(B) After a final decree of adoption is entered, the biological parents of the adoptee are relieved of all parental responsibilities and have no rights over the adoptee.

(C) Notwithstanding any other provision to the contrary in this section, the adoption of a child by an adoptive parent does not in any way change the legal relationship between the child and either biological parent of the child whose parental responsibilities and rights are not expressly affected by the final decree.

(D) The validity of the final decree of adoption is not affected by an agreement entered into before the adoption between adoptive parents and biological parents concerning visitation, exchange of information, or other interaction between the child and any other person. Such an agreement does not preserve any parental rights with the biological parents and does not give to them any rights enforceable in the courts of this State.