但是延期還沒有批的時候可以交綠卡申請嗎?
-Yes. Your parents can file I-485 any time based on your I-130 no matter they legally stay or illegally stay.
非移民和移民可以同時交嗎?
-If they file extension application before I-485 filing, they can file I-485 any time. If they file I-485, they don't need to file B2 extension.