请教：
1。 小侄一定要回国面试吗？-Yes if he wants to get the immigration visa there. Another choice is that he can file I-485 in US to get the green card after his father enters US to become a green card holder and thus, not need to get the immigration visa. But this choice takes more time for him to get the green card.
2。 如果回国面试后拿到移民签证，他可以不跟父亲一起入美景，而自己先回来上学？-No. He only can enter US together with his father or after his father enters US.
3。 他可以在美国这边办无犯罪证明吗？-He needs to get it from China for his record in China. Of course, if he choose to file I-485 in US, he does not need this kind of document.
