First & middle name missing on my wife's (US citizen ) birth certificate. What other documents will USCIS need ?

There are secondary documents that help such as hospital records, baptismal records, school records, medical records, together with affidavits from...

If I do an affidavit, will i be responsible for him only financially, or will it include his new US citizen wife &children?

Your only financial responsibility is to your cousin.

How to write an oath about lost travel document.

You are permitted to re-enter the US with just a green card given you have only been out 2 months.

Divorce in CA

While this is not an immigration question, note that Divorce laws are state specific and may have a residency requirement. You did not disclose...

EAD clock ?

The I765 is singularly attached to an application and follows only that application.

Is it OK to have a P.O. Box mailing address overseas? or should I provide a mailing address for a relative in the US?

I would recommend using the US address of your relative. However would be good idea to put your name on box to avoid the chance of mail not being...

Can a naturalized US citizen go back to the country of birth and live there?

You can as long as the country you are going back to will allow that.

Am I eligible for DACA?

No as the initial qualifier is that you have been in this country at least by June 15, 2007.

Can I get marriage license in New Orleans with expired visa?

You should direct your questions to the Clerk in New Orleans, as marriage requirement are a state issue and not an immigration issue. I don't see...

You should apply for business visitor visa if you plan to travel to the US for a business convention or a seminar, negotiate contracts, meet with...