evidence: (E)(i) a child adopted while under the age of sixteen years if the child has been in the legal custody of, and has resided with, the adopting parent or parents for at least two years or if the child has been battered or subject to extreme cruelty by the adopting parent or by a family member of the adopting parent residing in the same household: Provided, That no natural parent of any such adopted child shall thereafter, by virtue of such parentage, be accorded any right, privilege, or status under this chapter; or (ii) subject to the same proviso as in clause (i), a child who: (I) is a natural sibling of a child described in clause (i) or subparagraph (F)(i); (II) was adopted by the adoptive parent or parents of the sibling described in such clause or subparagraph; and (III) is otherwise described in clause (i), except that the child was adopted while under the age of 18 years;