We are U.S. citizens, and we adopted a foreign national child eight years ago. The child is now living with us in the U.S. as a permanent resident. Can we file a naturalization petition for him?
Yes, if the child is now under the age of 18. You may file a Form N-643 (Request for Certificate of Citizenship on Behalf of Adopted Child) on behalf of the child. If the child is over 18, he has to apply for naturalization on his own behalf.
