T visas are available to victims of severe forms of trafficking in persons (T-1 visa), their spouses (T-2 visa), their children (T-3 visa), and their parents if victims are under twenty-one years of age (T-4 visa).
U visas are available to victims of certain crimes (U-1 visa), their spouses (U-2 visa), their children (U-3 visa), and their parents if victims are under twenty-one years of age (U-4 visa).