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姪兒來美國讀高中，我們是他在美國的監護人，他去簽證時需要有委托監護人的公證書嗎？多謝
-Had better provide it.
Also read these links before the child leave China for US if the child is < 21:
https://help.cbp.gov/app/answers/detail/a_id/268/~/children---child-traveling-with-one-parent-or-someone-who-is-not-a-parent-or
Letter of Consent for Travel of a Minor Child - US ...