Applicants who believe they are entitled to immigrant status based on a relationship to a United States citizen or lawful resident alien, should request that relative to file a petition with the nearest office of the U.S. Citizenship & Immigration Service (USCIS) in the United States.
In general any applicant for an immigrant visa must be the beneficiary of an approved petition. Certain applicants such as priority workers, investors, certain special immigrants, and diversity immigrants can petition on their own behalf. All other intending immigrants must have a relative or potential employer petition for them.
For detailed information please see the family immigration information page.