回複：請教老師I-131

我給父母申請綠卡，打算同時遞交I-131. 請問以下幾個問題

1. Part 2 Application Type： Should I check '1d I am applying for an Advance Parole Document to allow me to return to the United States after temporary foreign travel‘？ 
-Yes.
2. Part 4 1a purpose of trip: Can I simply put 'visit family members in China'?-Yes. Or should I provide more details. Do I need to provide documents of proof for this purpose?-Not necessary.

3. Part 7 On a separate sheet of paper, explain how you qualify for an Advance Parole Document, and what circumstances warrant issuance of an Advance Parole
What should I do?
-Just say "I am filing I-485, Application to Register Permanent Residence or Adjust Status, and I am apply for advance parole based on my pending I-485". 

Do I need to attach a separate paper?
-Yes. Write some words as I suggest above.

And what reasons should I provide? I apply for I-131 for my parents to go back to China in case their Green Card will not be approved within 3 months as they plan to go back to take care of my grandfather for a couple of months.

Thank you very much!