Fiancé(e) You may petition for a alien fiancé (K-1 Visa) and their eligible children
(K-2 visa) to come to the United States under a non-immigrant status if:
Spouse You may petition for a alien spouse (K-3 Visa) and their eligible children (K-4 Visa) to come to the United States as a non-immigrant if you are a U.S. citizen. This process takes longer for the admission of the alien as does the application for admission of the alien by the K-1 Visa.
Eligibility Requirements for Children of your Fiancé(e) or Spouse The children of your alien fiance or spouse must meet two requirements in order to be allowed to accompany the alien. The children must be unmarried and must be under 21 years of age.K-1 visa)