My brother whos American Citizen filled I130 pettition for me. Do I need to wait 13years or can i get before with a lawyer firm?

Unfortunately a lawyer cannot really make this process go any faster once the paperwork is filed. You may be eligible to get a green card through...

My Fiance got rejected for visitor visa few months back. So, would she had a problem when apply for K1 fiance visa for her?

She should not have any problems with the fiancé visa. Denial of the visitor visa has no negative consequences for the K-1 visa. You will of...

USPS lost my green card

You have two options now. First is to immediately schedule an infopass appointment and ask them to put a temporary I-551 stamp in your passport. ...

You will need to check with your own country's Embassy in Mexico and ask them if there exist any entry requirements for citizens of your own country.

Can I leave USA during Security clearance check of my spouse after F2A interview?

Yes you can leave while his security check is pending and then return together with him.

I have my interview on 9/3/14 but I'm traveling the sane night for a family emergency. Would I be able to postpone the oath?

Yes you can postpone the oath ceremony.

I-864 income and household size

You are correct. The correct number is four in your example.

In I-864EZ, Part 3 - 9 is: Place of Residence (if different from mailing address). What if it's the same?

To avoid the problem of having it returned again just fill it in even if it is the same.

No you do not need to send the third year if you were not working. You should take or send your most recent pay stubs to show current income.

Notice of things to bring to the Citizenship interview. The notice mentioned to bring my wife's Tax return. She filled as Single

Your wife can file amended returns. Bring your amended returns and other proof that you are still married and living together.