A USC over the age of 21 May petition for his or her parents.

Yes based on timing of filing, the visa may be cancelled.

Yes if you have valid status and have maintained such status.

Either way suffice for the I751 application.

I agree with my colleague - refer to the reciprocity chart for alternatives.

I agree that this sponsorship will be scrutinized but can be done.

Selected as the best answer

Best to have an attorney review your previous submission to determine how best to proceed.

You are not required to change the “in care of.”

NVC likely doesn’t have your case so contact USCIS for guidance.

USCIS does not provide receipt of RFE response.