I agree with my colleague. Attempting your application without speaking with an immigration attorney is not a good idea.

Need to find out about beneficiary's change of address after filing I-130

I agree.

Can my German wife take steps to change her name in the states before getting her green card?

To avoid delay or confusion, identifying documentation with names should attempt to be uniform throughout the application process.

Was detained 2x while crossing the border my fingerprints & pic was taken and I was sent back to MX how do I answer ?16 on I-130

I agree--an immigration attorney will be vital here.

Do I need the FBI fingerprint background check?

I agree. You should know.

Will I have a problem getting a new unconditional green card?

I agree with my colleagues.

Is tax returns one of the requirements to be submitted while filling a permanent residency for my wife.

You will be required to file an affidavit of support/find a joint sponsor if you cannot prove the required income or asset requirement.

How can my grandpa go back to US again?

You should definitely consult with an immigration attorney for the particulars. A permanent resident is not regarded as seeking an admission...

Whats to do if FOIA is taking to long to respond to prove a case what next shall I do to get my green card?

As mentioned by my colleagues, your efforts to gain a copy of your original paperwork are steps in the correct direction, but have not yielded...

Please tell me how long is gonna take until my daughter could came in USA ,she'll be 21 in 02/13,I applied for green card in Aug

I agree with my colleagues.