Best to work with your retained counsel who understands your case best. Or seek a second opinion in private with full review of your case.

Assuming you are a USC, you will file Forms I130, I130A, I485, I864, I944, I765, I131. Best to work with an attorney for guidance.

If your income does not satisfy the requirement, you will need a cosigner. Your spouse’s income may be used if he has authorization to work. Best...

For how long can I extend my parents stay in the US on B2 visa beyond the 6 month period?

They may request an up to 6 month extension.

Best to have an attorney review the NVC correspondence and documents submitted.

If I divorce my wife will she lose her immigration status?

No she may file for the removal of conditional residency with a waiver of the joint filing requirement.

Form I765 - Question 27 - Eligibility Category for Spouse in US on Visitor Visa?

Category is C9 based on info provided.

Yes you may change lawyers after approval of VAWA. You may use the Avvo search tool to consult with others.

Best to work with an attorney for such a response. Good luck!

If I have an employment based I-485 AOS. Can I file another I-485 AOS family based If that will be faster route to a green card?

Yes you may file a family based AOS petition if eligible.