Citizenship laws for children who turned 18 prior to February 27, 2001

For those children who turned 18 years old prior to February 27, 2001, a lawful permanent resident qualifies as a derivative citizen if he or she entered the United States under the age of 18 years old as a green card holder and one of the following four conditions applies, which also had to occur under the age of 18:

1. Both biological parents become naturalized United States citizens.
2. A legal separation occurs between the biological parents and the lawful permanent resident child is in the legal custody of a parent who is a naturalized citizen.
3. A lawful permanent resident child is in the custody of a biological parent who is naturalized and the other parent is dead.
4. A lawful permanent resident child is in the custody of the biological mother who is a naturalized United States citizen and paternity has not been established through legitimation