Yes, with a valid I-551 stamp on your passport..

The household size for I-864 purposes remains constant. Sponsoring multiple beneficiaries does not change the fact. Consult a qualified lawyer if...

Yes, it is possible to get EB1A /2 NIW approved without publication.

Probably yes, you may receive a copy..

USCIS online updates may be unreliable. Try calling USCIS for status inquiry at 800.375.5283. Best of luck.

I agree with the above assessment. Lawyer for the group is appropriate to consul you because we don't have all your information.

Your question is less than clear. For immigration purposes, the relatives mentioned are ineligible for derivative status of a petition.

Why the bar in the first place, additional information specific or unique to your situation is required.

Yes, you can without problems. Travel to PR is considered a domestic flight because it is a US territory. A photo ID or passport is required to...

In addition, the USCIS local field office that prepared original I-652 may help. Give them a ring..