You likely will not be able to speak to a real officer over the phone. You can consult with an attorney for further guidance.

No, likely not. The officer will be a different one.

You should attach a copy of the I485 receipt and indicate that a fee is not required based on category filing.

Yes, you may marry even if your green card is expired. Good luck!

The US citizens spouse may petition for the spouse and apply for adjustment of status thereafter. Consult with an attorney for further guidance.

As a US citizen, you may petition for your sibling but it will take about 12 to 14 years for the visa to become available.

It will be very difficult to do so with a pending application for permanent residency.

N400 interview concern

As you will be applying under the five year rule, you do not need marriage evidence to establish eligibility.

Even if for medical reasons, medical marijuana can have problems for immigration purposes. Consult with an attorney for guidance.

I agree with my colleagues. Best to have an attorney review your statement.