Will the student visa be affected if my brother goes to study in the United States?

No, studying abroad will not directly affect my brother's student visa, but it may have a certain impact on the applicant's proof of funds, family relations and other materials. Visa is the endorsement and seal of a country's sovereign organs on passports or other travel documents held by its own or foreign citizens to show the procedures for allowing them to enter, exit or pass through its territory.