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Hmm, is the lawyer requesting I-485 fee waiver? Is that waht you mean? If granted, then all I485/765/131 should be free. Also for your category, I360 fee is waived.

Because your son originally was the accompanying derivative to your previous application based on that marriage, he can be a derivative now, either accompanying or fowllowing to join. In your case, it's following to join, I824 requesting immigrant visa interview once your I-485 approval.