回複：父母申請綠卡要求麵試, 要求帶的材料中有所有孩子的出生公證,這是必需的嗎?

not a general requirement for this category. Can there be a special reason that USCIS made this specific request in your particular case? If such case, those certificates will be required. If not,it may be just a template letter for applicants of all categories and thus not applicable to your category.