回複：我兒子跟我一起在２００７年遞交了４８５申請（EB2)

relink or file another I-485. each has pros and cons as discussed intensively in past 2 years.
It's not only your son's case, your I-485 case is in exact same condition, to relink or to file another I-485 based on spouse's approved EB1.