K-3 and K-4 Visa
The new K-3 and K-4 visas are available to foreign spouses of U.S. citizens, and their unmarried children under age 21, who wish to enter the U.S. to be united with their U.S. citizen relative while their immigrant petition is pending. The purpose of the K-3 and K-4 visas is very similar to the K-1 and K-2 visas; to allow families to be united. The difference between K-1 and K-2 from K-3 and K-4 is that a marriage has already occurred prior to the foreign spouse and children having entered the U.S.
Unlike the V visa, there is no additional K visa category that enables visa issuance for the grandchildren of the spouse or the petitioner.
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