我朋友的住址虽然不远， 可是不跟我的在一个district/city, 但是我不太明白你说的“confused in background check”，因为所有的表格上都显示的是我朋友的住址呀。因为我是把我朋友的住址作为我的住址， 我妈妈跟我住一起。
-In the G-325A, your mother has to indicate her true living address in this case because USCIS/FBI will do the backgound check. If they could not find your mother is really living in your friend's home, it might result in confusion.
You can use your friend's home address for your mother's I-485 address because the address in I-485 is just for case communication. But you have to provide the true living address in the G-325A.
