自己看下面美国移民局关于收养16-18岁之间孩子的解释

Instructions for a Hague Convention Birth Siblings between Age 16 and 18

The International Adoption Simplification Act of 2010, Public Law 111-287, amended section 101(b)(1)(G) of the Immigration and Nationality Act to allow the birth sibling of an adopted child to qualify as a Hague Convention adoptee after the birth sibling’s 16th birthday, but prior to the birth sibling’s 18th birthday. After November 30, 2010, a Form I-800 may be filed, in accordance with form filing instructions, if;

---The child is from a country Party to the Hague Convention on Protection of Children and Cooperation with Respect to Intercountry Adoption
---The child is the birth sibling of another foreign national child who has immigrated or will immigrate based on adoption by the same adoptive parents
----The Form I-800 is filed before the expiration of the notice of approval or extension of the I-800A, Application for Determination of Suitability to Adopt a Child from a Convention Country, and before the child’s 18th birthday