More information is needed about your marital history to determine if you may be eligible for VAWA relief. Best to consult with an attorney in...

Contact NVC to inquire about the error in the form.

Yes, he may apply for a fiancée visa however the previous denied entries may affect subsequent application.

I agree with my colleague. Why do you want to cause the family problems? You may write to USCIS with your inquiry.

Can my mother (green card holder) stay outside US for more than 6 months?

It depends on her specific circumstances, but given the current climate, reentry is possible.

You may sign for your child in the circumstances indicated.

Best to refer to the form instructions for guidance.

Should I divorce my wife before filing for i751?

Yes you may file for a waiver of the joint filing requirement with evidence of the good faith marriage and final divorce decree.

You may but the first marriage will likely be scrutinized given circumstances.

No you should await rescheduling at this time.