回复：非常谢谢8老师的指导。还有问题请教。

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?