回複:請教,家庭移民類別的第一優先是否包括citizen的已經離婚(有子女)的子女?
Yes. FB-1: unmarried son/daughter of U.S. Citizen >= 21 years old . When your married son divorced, he automatically converted from FB-3 to FB -1 becaue petition is now based upon an unmarried son of a US citizen.