This is a serious matter that requires the assistance of both criminal and immigration attorney.

Yes the RFE will stop the I765 clock.

Refer to the I864A form instructions for guidance.

No this will not impact your petition for your son.

No not advisable without status in the US.

No there is no requirement upon departure.

Yes that interpreter must complete paperwork at start of interview.

Depends on whether he qualifies based on CSPA calculation. Consult with an attorney for guidance.

Best to consult with your attorney re: evidence to be provided.

It can take 12-18 months for I485 interview to be scheduled.