Will immigration officer inquire about marital status even if you file for citizenship under Permanent residency for 8 years?

Yes, the immigration officer will ask your marital status and you should be honest about it. I don't think it will affect your naturalization just...

You need a separate application to apply an advance parole. If you applied one, it should be on your mail soon. Otherwise, you can request to...

245(I) Grandfather rule. isn't it true as long as you have LCA approved and properly filed before deadline april 2001 can be

Yes, you can use 245(i) until you obtain your green card as long as the application/petition is meritorious, not frivolous and approvable when...

I have been deported and am looking for a way back home http://caselaw.findlaw.com/us-9th-circuit/1475165.html

Have a private consultation with an experienced immigration attorney to discuss your options.

With conditional green card am I able to petition for my 18 years old dependent?

As a greencard holder, whether permanent or conditional, you would be able to petition your unmarried children.

You need to advise NVC about the error by emailing or writing a letter and attach a copy of your birth certificate.

Do I need joint sponsor?

You should ask someone to be a joint sponsor if your income is not sufficient.

Can my wife would be my joint sponser

Yes, your wife even a conditional greencard can be a joint sponsor.

Finger printing letter received second time though i already gave it a month ago

I agree with my colleagues answers. In addition, you can still try to do your biometrics on the address provided. Explain that you just received...

Help when submitting U visa application: I have two last names because I am from Mexico. Do I need to use a hyphen between them?

In submitting your application, follow the name as appearing in your birth certificate or passport.