Can the physical mailing address be replaced to a p.o box address?

That depends on what type of case you have or what time of correspondence you are expecting from USCIS. You have to be a bit more specific about...

My mom and dad are perement residents

If your parents legally obtained their green cards and haven't done anything bad to make them deportable since they got their green cards, you...

C-1 visa seaman / position deck steward

Even if an immigrant visa is available, someone who entered on crewman visa (C1/D) is generally barred from getting green card in the US through...

I'm naturalize citizen from green card K1 visa. Divorced and now currently just got married to a B1 visa out of status since 0'6

You new spouse appears eligible for the green card application process in the US (called adjustment of status) through you (a U.S. citizen) since...

Based on what you described, you should be eligible 245(i) adjustment when the 2nd petition (with Aug. 2010 PD) becomes "current" under F1, F2B, or...

Will he be deported if I don't sign the I-751?

I understand you are hurt and upset. But I doubt your husband will be deported just because you refuse to co-sign on I-751 petition to remove his...

How much is the annual income required to.petition my siblings through my mom's application?

Your permanent resident mother's petitions for your siblings will be under the preference category/ies - F2A (if under age 21) or F2B (if age 21 or...

I don't know where you hear that renewing green card is that hard. Assuming you did not obtain your green card fraudulently, I would not worry...

It probably means your case was pre-approved by the interviewing office and is waiting for the supervisor's or senior officer's final approval. ...

How long one should wait when I-797 receipt action letter establishing prima facie case was received 5 months back.

USCIS Vermont Service Center (presumably processing your friend's VAWA case, with "EAC" on the case number) is still processing I-360 cases from...