Illinois State Law on Adult Adoption

Illinois

Summary: Adults may be adopted when the person to be adopted has resided in the petitioner's home for 2 consecutive years in a parent-child type relationship, or where there is a "relationship" as defined by law, with consent of the person to be adopted.

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Most Relevant Illinois Statute:
Illinois Adoption Act 750 ILCS 50/

Section 1. para. B. Related child

"Related child" means a child subject to adoption where either
or both of the adopting parents stands in any of the following
relationships to the child by blood or marriage: parent, grand-parent,
brother, sister, step-parent, step-grandparent, step-brother,
step-sister, uncle, aunt, great-uncle, great-aunt, or cousin of first
degree.

Section 1. para. F. A person is available for adoption when the person is:

(d) an adult who meets the conditions set forth in Section 3 of this Act;

Section 3. Who may be adopted.

A male or female child, or an adult, may be adopted, provided the other conditions set forth in this Act are met, and further provided,
with respect to an adult, that such adult has resided in the home of the persons intending to adopt him at any time for more than 2 years
continuously preceding the commencement of an adoption proceeding, or in
the alternative that such persons are related to him within a degree set
forth in the definition of a related child in Section 1 of this Act. [see above]

Section 8. Consents

(e) In the case of the adoption of an adult, only the consent of
such adult shall be required.