朋友申请她父母移民，近来收到移民局信要求补材料，其中一项是要求 补 “Family household registry--Please summit "HuKou” (户口) for the family，请问：
1）这是什么文件？是户口复印件吗？
-Photocopy is enough, but need to translate it into English. Had better do the 户口本公证 in China.
2）如果父母的户口地址不同，有影响吗？-No problem.
3）提交这些文件的目的是什么?-It seems USCIS do not trust the 出生公证 for Mainland-born Chinese, so they ask for 户口本公证 to prove the family relationship for Chinese
4）是必须提交的吗？-Yes, You need to provide what they ask for.
非常感谢！
