Is it an issue during a consulate interview to have the grandparents names listed as the parents on the birth certificate?

I agree. Better retain an attorney and start by preparing sworn declarations by each concerned.

Yes, it is highly probable that you will be called in for yet another appointment.

How do I cancel green card?

You need to be more precise: at which stage of the process are you now? If it is only the I-130 that is pending, then can send a letter to CIS...

Adjustment of status for minor children of US Citizen mom?

First you need to apply for each child’s adjustment of status in the USA.

What is my current status when I use green card Advance Parole ?

You are an applicant for I-485 adjustment of status.

Procedure laid down for withdrawal application submitted for Green Card.Addresses to whom application to be sent.

Submit the Withdrawal letter to whichever CIS service center you think has the file.

Is form I-864W only used for under 18 years old child who currently living in the US?

I agree. Read those instructions or else contact an attorney in private.

Is H1B and L1B clock same ? ?

Yes, time spent on L-1B is subtracted from the 6 years max on H-1B. In this instance as long as you spent at least a year outside the USA,...

Whether My Wife can apply H4 dependent visa by her own? if she can apply H4 dependent visa, how can she get H4 filed receipt ?

The H-4 is an individual application. Wife can apply on her own, without needing your employer.

E2 visa for online business?

I don’t see the possibility of E-2 here without hiring US workers and an important investment.