母亲的离婚证需要到国内公证处做离婚公证吗？
还是自己翻译成英文，到银行notarize 就行。
-Yes, you can ask your friend to translate it for you. But if you ask your friend to do it for you, you need to follow the format which is accepted by USCIS, e.g. certification by the translator must be included. Read these links:
http://www.uscis.gov/forms/forms-and-fees/general-tips-assembling-applications-mailing
http://www.nolo.com/legal-encyclopedia/free-books/fiance-marriage-visa-book/chapter4-14.html
https://www.legallanguage.com/legal-articles/uscis-translation/
http://www.immihelp.com/immigration/document-english-translation.html
Here is the USCIS Foreign Documents Translation Service website ($27/Page):
http://uscistranslation.org/
