Your adult child can petition for you. Consult with an attorney for guidance.

Once he turns 21 years old, he can petition for parents.

Best to consult with an attorney for guidance re: options available for you.

Yes it appears that your application has been approved.

No this shouldn’t present a problem is documents are unavailable because you weren’t working.

No best to refile the I485 with new I140.

Best to consult with an attorney to qualify for N648.

It depends on what you are filing for. Consult with an attorney for guidance.

Best to consult with an attorney for guidance.

No you need to file two separate petitions with appropriate filing fees.