1. My mom does not speak English. Should we need a translater?
-Yes.
Can I be her translater?
-Ask the local office whether you are OK, otherwise ask one of your friend to do it.
Should I go with her?
-Up to you. you had better go with her.
2. What else documents I should prepare for the interview?
-See the appointment notice. Normally bring all the original documents which were for I-485 filing.
Like family pictures, necessary?
-Not necessary.
3. Do you have any suggestions for the interview?