Family Based Immigration
Foreign citizens looking to live permanently in the United States require an Immigrant visa (IV). To be eligible they must be sponsored by an immediate relative who is at least 21 years of age and is either a U.S. citizen or U.S. Lawful Permanent Resident.
The types of Family Based Immigrant visas are:
Unmarried adult children of citizens, along with their minor children
Spouses and minor children of lawful permanent residents
Unmarried adult children of lawful permanent residents
Married children of citizens, along with their spouses and minor children
Siblings of adult citizens, along with their spouses and minor children