The following relatives may receive a green card – subject to visa availability:
2a. First Preference: Unmarried children over the age of 21 of US Citizens. Their children may be eligible to also obtain a green card.
2b. Second Preference: Spouses and minor children under the age of 21, and unmarried children over the age of 21 of Legal Permanent Residents.
2c. Third Preference: Married sons and daughters of U.S. citizens. Their spouses and children may also be eligible to obtain a green card.
2d. Fourth Preference: Brothers and sisters of adult U.S. Citizens. Their spouses and children may also be eligible to obtain a green card.