請教小白兔關於背景調查 and LUD 問題。

I am the pricipal applicant. I have get no LUD since I-485 in 2005.

My wife and son get LUD on March,2007. Our family have 2nd FP on April, again, my wife and son get LUD the day after FP. But I did not get any LUD.

Have told Local office, and was told NC was clear Feb, 2007.

So, what is the possible reason for such Weird LUD? Any good explanation?

Thanks