K-1 VISA OVERVIEW
The K-1 non-immigrant visa (Fiancé(e) visa) allows a foreign-born individual to enter the U.S. to marry their U.S. citizen partner. It is effective only for 90 days from the time of arrival in the U.S. It means that the K-1 visa holder must marry their partner within that period.
Once married within 90 days of being admitted to the United States as a K-1 non-immigrant, the foreign fiancé(e), now the spouse, can then apply for lawful permanent resident status (a Green Card) by filing a Form I-485 application for adjustment of status with USCIS.
K-2 VISA OVERVIEW
If your foreign-born fiancé(e) has an unmarried child under 21 years of age, they’re eligible to come to the U.S. using the K-2 non-immigrant visa. This type of visa is a derivative visa of K-1 and depends on the successful processing of the K-1 visa.
When the child’s (or children’s) K-2 visa has been approved, they can travel with your fiancé(e) to the U.S. They also have the option to travel within a year after your fiancé(e) arrives in the United States. They will be included in their parent’s LPR application, so they will also get a Green Card when their parent gets theirs.