Sec. 2. (a) If the adoptive parent of a child is married to a biological parent of the child, the parent-child relationship of the biological parent is not affected by the adoption.
(b) If the adoptive parent of a child is married to a previous adoptive parent, the parent-child relationship of the previous adoptive parent is not affected by the adoption.
(c) After the adoption, the adoptive father or mother, or both:
(1) occupy the same position toward the child that the adoptive father or the adoptive mother, or both, would occupy if the adoptive father or adoptive mother, or both, were the biological father or mother; and
(2) are jointly and severally liable for the maintenance and education of the person.