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8老师，非常感谢！

2 follow-up questions:

1) When we know we cannot get the document within 87 days and decide not to leave US, should we send a letter to USCIS to explain that we need more time to get the document?
-USCIS may not care about your request for change of the deadline, but it is not hurt you to try.

 2) My father's name in Chinese passport is spelled in Pinyin. Although my father has not changed his Chinese name, the spelling of his name in Roman character when he was in Indonesia are different. It was spelled based on the pronouciation of fujian dialect. So if we can find his birth certificate, the name will be different from his name on passport. How should we prove to USCIS the 2 spelling are the cultural variation of the same name?
-You may talk to the local Chinese Police Department (派出所) to issue a name change certification/verification letter of your father (from Roman character to Pinyin), then do the notarization.

 Appreciate your further insights!