我這是一稿多投，學術腐敗，在法律谘詢壇問了，到這裏向專家再請教一次
我們從綠卡到公民已經是很久以前的事了。最近發現我們老頭老太都有Certificate of Naturalization，但孩子們都沒有，當然他們早就有了美國護照。估計當時我們兩口子拿到Certificate of Naturalization就去申請美國護照，捎帶把孩子們都申請了。
-Your kids' US passport is good enough to prove their US citizenship, so it is not necessary to get the certificate of US citizenship. But if you want to get it, just file N-600 to USCIS. If your kid is over 18 years old now, he/she can file N-600 by him/herself. If your kid is less than 18 years old, then you can file N-600 on behalf of your child. See this link:
Application for Certificate of Citizenship | USCIS
護照經常要renew，如果他們要得到Certificate of Naturalization or Citizenship，具體程序是怎麽樣的？
普遍認為美國護照也是美國公民證明，但Certificate of Naturalization or Citizenship似乎更正式一點。我有個孩子（成年很多年了）最近目睹了ICE當街抓人，有點膽戰心驚，問了Cergificate of Naturalization。我們有些內疚，沒在他們未成年時做到底。
-You worry too much.
謝謝！
