Got the good news this morning. 
My parents waited in line for more than a hour for fingerprinting, about a minute in front of the officer, he didn't look at any of the documents we prepared, just asked the pictures, as soon as he saw my brother's cute little son, and my mom told him that my brother live in china, that's it! This is their first time to apply a visa.
My parents waited in line for more than a hour for fingerprinting, about a minute in front of the officer, he didn't look at any of the documents we prepared, just asked the pictures, as soon as he saw my brother's cute little son, and my mom told him that my brother live in china, that's it! This is their first time to apply a visa.