Can I file a Form N-600 for her daughter so she can become a United States citizen?
— Loc A. Form N-600, Application for Certification of Citizenship, allows persons to claim United States citizenship if they are the biological or adopted child of a United States citizen, were born outside of the United States, and are claiming citizenship by action of law. Unfortunately, the immigration requirements are very narrow, and it does not appear from the facts presented that your wife s daughter is eligible to become a United States citizen. Some of the very narrow requirements are that you have at least one parent that is a United States citizen and that the child be a lawful permanent resident. It appears in this situation that the relationship is not a biological father-daughter, rather a step-parent/step daughter relationship. The rules specifically state that this form should not be used by stepchildren. Even if the father legally adopted his wife s daughter, the daughter is still not eligible for Form N-600 because she does not meet the permanent resident requirement
