One more question regarding I-130 question no. 16; "Has your relative ever been under immigration proceedings?"

This post necessitates more inquiry as to how it was handled at that entry. People do not always correctly know or can recollect events this far...

Green card

Use the Form AR11 and also call the customer support.

My parents have green card since 1986 and want to give it up and instead need visitors visa .

Not surprising.

Two years ago i sent 400 dlls for the immigration interview. can i use that credit for my new interview?

NO.

H4 visa to L1A visa

One visa denial should not affect another visa although Consulates can do so in some situation.

What's the process

show that you should not be deported instead should receive work authorization and also that you are entitled to file AOS under the rules.

Yes. This is fine.

My green is expired and I am out of the US since August 2012. What I have to do to renew my green card?

Long absence from U.S. and an expired green card has turned this situation complex. You can benefit from seeking professional help. Best Wishes!

Florida, Delaware or Nevada LLC for a non-resident?

Sounds like a great idea but to know what legal limits it may have check with an experienced professional in this are for advice so that you do it...

Immigration consequence of criminal conviction is a complex world. You should gather the police report, court records detailing the charges and...