What should i answer on the DS160 application for B1/B2?

Hire an immigration lawyer to review your application before filing.

Getting a USA government issued document to be used as proof for Marriage License issued by Government of India

You need to deal with someone who practices law in Kansas in order to figure out what to do. US government accepts all valid marriages foreign and...

My children are on b1/b2 visa if they over stay what effect them

You do not want to subject your children to illegal stay in the USA.

PERM with different employer?

"Maybe" is an operative word here which suggests foul play and bad intentions.

My record was expunged back in 2010 for crap that happened back in 1991.

Expungement does not work for immigration law purposes.

I guess you need to do whatever your attorney advises you to do, since no one can advise you without knowing the procedural history of your case....

I am currently under a visa A3. My employers are going back soon in their home country. I found a job, can I work?

You cannot work on A3 for another employer unless you change your status to a suitable one which among other things allows you to stay and work here.

I am on b1/b2 visa with my family can I stay here even my kids are going school

We cannot give you any legal way of anything. For that, you need to talk to an immigration lawyer in NY or NJ and review your situation.

My H1B case is pending from past 8 Months. How can I get the Correct status??

221g is the Government's exercise of their discretionary power granted by Congress. You can do nothing except trying to figure out the problem and...

L1a to Green Card on EB1 Category Filing

You can only do what the employer is willing to do. The rest is beyond your control besides looking for a new employer. AS such, your question is...