Who can file Form N-600, Certificate of U.S.Citizenship
Additionally, in cases where the individual was under 18 years of age on February 27, 2001, but did NOT meet all the required conditions mentioned above, then that person should qualify for U.S. Citizenship in his/her own right.
You may also file for a Certificate of Citizenship if the following happened before your 18th birthday and prior to February 27, 2001:
1. You consistently lived in the U.S. after being admitted lawfully as permanent resident; and
2. Both your parents, the parent awarded legal and physical custody of you, or the only surviving parent is a U.S. citizen by naturalization.
If you are the biological child of a U.S. citizen,born outside the United States and claiming citizenship by having been born to U.S. citizen parent(s), you automatically become a U.S. citizen at birth if:
1. If both your parents are U.S. Citizens and one of them resided in the U.S. This residence must have taken place prior to your birth; or
2. If one of your parents is a foreign national and other is an U.S. citizen who, before your birth, had physically been in the U.S. for a period or periods totaling not less than five years, of which at least two of those were after the parent's age of 14 years.
General Outline for filing Form N-600 :
1. Individuals born outside the U.S., claiming to have U.S. citizenship by birth to a U.S. citizen parent.
2. Individuals born to a U.S. Citizen outside the U.S or who met all the requirements for becoming a U.S. Citizen prior to their 18th birthday.
3. Individuals who were adopted or biological children under the age of 18 who meet the requirements for citizenship, the form N-600 application must be filed by the U.S. citizen parent or legal guardian who has been given legal and physical custody of the child.