Which type of child qualifies as a stepchild of a USC?

The correct answer highlights the essential definition of a stepchild in relation to a U.S. Citizen (USC). A stepchild is typically recognized as the biological or adopted child of a spouse from a previous relationship. In this context, a biological child from previous marriages fits that definition perfectly, as they maintain their status as a child of their biological parent, who is now married to a U.S. Citizen.

This relationship is significant in legal matters, particularly in immigration processes, where being recognized as a stepchild can provide certain benefits and pathways. The acknowledgment of a stepchild under immigration law often requires that the marriage to the biological parent occurred before the child turned 18, which further supports the confirmation of their status as a stepchild.

Adoption after the age of 18, natural children born after 18, and legitimated children after the age of 18 do not meet the criteria to be classified as stepchildren since they either do not follow typical legal definitions of a stepchild relationship or occur outside the age threshold necessary for consideration as dependents in such contexts.