Children of fiancées can also accompany them to the United States as they can be issued K-2 Visas. The U.S. citizen must file a petition with the USCIS on behalf of the foreign fiancé(e). After the petition is approved, the fiancé(e) can obtain a K-1 Fiancé Visa.
The K-1 Visa is issued at a U.S. embassy or consulate abroad. Again, the marriage must take place within 90 days of the fiancé(e) entering the United States.
The K-1 Visa applies to both Fiancée and Fiancé of United States citizens.
K-1 Fiancée and Fiancé Visa Eligibility Requirements: Until the actual marriage takes place, the fiancé(e) is considered a non-immigrant. After the marriage takes place, the foreign national may apply for a green card through a process called Adjustment of Status at their local USCIS office.