It is possible. It is best to consult an immigration attorney.

With regards to G-4 visa: If I am not the G-4 principal alien (my wife is), can I study a full time PhD on this visa?

You would need to consult the school's DSO. Normally you would apply for a F1 visa.

Is my US citizen wife considered to have maintained her US domicile for the purpose of filing Form I-864?

Yes she can still file the I-864. You should also consider having a co-sponsor. Consult an attorney.

When filing K1 visa, do i have to include fiance' son on I-129F, even though he won't be coming with my fiance'?

Yes he has to be included on the fiance visa. Consult an attorney to assist you.

My husband attended his initial naturalization interview and the officer gave him an N-652 form that she did not make a decision

You should consult your attorney who knows all the facts of the case and attended the interview.

Status of L2 visa holder when L1 Visa Holder leaves US

As soon as L1 visa status ends, the L2 status ends. An application to change status should be done as soon as possible. Consult an attorney.

RFE-NOID-NOID: B1 to H1B COS: 2008 approved petition under cap exempt

You need to consult an immigration attorney as soon as possible. It is important to respond to the NOID with documents that support your position...

Yes and yes.

Can ICS track me down and arrest me for immigration violation?

You should attempt to be reinstated. That is your best option at this point.

My I-94 and old passport are expiring on 08/11. I have already new passport. Can I travel to Canada to renew I-94?

Generally your attorney is correct. If you leave the US and go to Canada for less than 30 days they usually do not take away your I-94. You may be...