Yes, H1B visa holders can bring eligible family members with them to the U.S. Family members of the H1B visa holder can live in the country throughout the stay of the primary visa holder. In order to be eligible to do so, the dependent family members must apply for the H4 application. Candidates can apply for the H4 visa at the same time as the H1B visa application or after the H1B visa holder leaves for the U.S. Spouses and unmarried children under the age of 21 are considered as Dependent family members.