移民局认为一个父母死了也可以作为孤儿移民。

https://www.law.cornell.edu/wex/orphan

https://www.uscis.gov/adoption/immigration-through-adoption/orphan-process

Under U.S. immigration law, an orphan is a foreign-born child who:

• does not have any parents because of the death or disappearance of, abandonment or desertion by, or separation or loss from, both parents
  
  OR
• has a sole or surviving parent who is unable to care for the child, consistent with the local standards of the foreign sending country, and who has, in writing, irrevocably released the child for emigration and adoption