Questions and issues about entry to India is best addressed by the Indian embassy/consulate. You may also contact an Indian immigration lawyer.

I see no reason not to try. That's the purpose of the tool.

Parents marital status is inconsequential in determining eligibility for USC petition for either parent.

There are eligibility requirements. Yes, if you are eligible.

In general, US immigration laws do not administer the issue/renewal of DLs. I agree with Attorney Behar, you may contact your local DMV agency....

Generally, failure to correctly and timely respond to an RFE is denial for lack of prosecution.

The notice you received is normal if NBC determines an interview is not required.

You have the choice to pursue both options and eventually go with the efficient one. Consider retaining an immigration attorney for guidance.

USCIS will not deny an I-130 because a naturalization certificate number is missing because you have a number. There is going to be an opportunity...

This is a family fourth preference case, and you cannot file a concurrent 1-130/I-465. You may file I-130 now file I-485 when a visa is current....