My fiance has a child, can the child come to the US with my fiance?

If your fiancé has a child that you would like to bring to the United States as well, they both can come to the United States together, presuming that the child is under 21.
They would go into their interview at the Consulate and apply for a fiancé visa. The child is going to be issued a K-2 visa and the parent is going to be issued a K-1 visa.

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When United States immigration authorities provide permission to foreign nationals holding a nonimmigrant visa in the U.S. to change status to another nonimmigrant category while in the U.S. that constitutes a Change of Status. After temporarily entering the United States for a specific purpose such as business, study, temporary employment…
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