You can file for CRBA. Consult with an attorney for guidance.

Employment must be disclosed so yes this will come up during interview.

Best to contact USCIS to provide correct address.

Yes you may as a USC spouse. Consult with an attorney for guidance.

He can apply for a tourist visa if eligible.

Best to consult with an attorney in private to review your history and eligibility.

No the joint sponsor should be sufficient.

I agree with my colleague about contacting USCIS for updates.

She will most likely need to reapply for the green card if her previous green card was abandoned or surrendered. Consult with an attorney for...

It should not be you should notify USCIS of changed citizenship.