(1) An adult may adopt another adult or an emancipated minor pursuant to this section. However, an adult may not adopt the adult's spouse. An adoption of an incompetent individual of any age must comply with all requirements set by law for the adoption of a child.
(2) An individual who has adopted an adult or emancipated minor may not adopt another adult or emancipated minor within 1 year after the adoption unless the prospective adoptee is a sibling of the adoptee.