Family First:

Unmarried Sons and Daughters of U.S. Citizens.

Family Second:

Spouses and Children, and Unmarried Sons and Daughters of Permanent Residents.

Family 2A:

Spouses and Children of Permanent Residents;

Family 2B:

Unmarried Sons and Daughters (21 years of age or older) of Permanent Residents.

Family Third:

Married Sons and Daughters of U.S. Citizens.

Family Fourth:

Brothers and Sisters of Adult U.S. Citizens.