If you automatically obtained citizenship before your parents’ divorce, you can still apply for the Certificate. If, on the other hand, you obtained citizenship after their divorce (and after being born), you will need to submit proof showing: That you were in the legal custody of a U.S. citizen parent prior to your 18th birthday That you were admitted into the United States as a lawful permanent resident, again, before turning 18 Note: if you were in the legal custody of a non-U.S. citizen parent during this period, you may not automatically receive citizenship status.