Yes, if you reported a stepchild as biological or vice versa, that is fraud or misrepresentation. Every information on the N400 or interview must...

You must file N400 where you now reside. The process of guardianship application in your state or any other state, has absolutely no impact on your...

The children apply for a visitor's visa to visit you in the US.

I doubt if you will get an RFE, but it's up to discretionary decision of the reviewing officer.

Your Joint I751 would be approvable. However, it appears your naturalization is best suited under the 5-year reregulation. You are allowed to file...

In general, initially, only a tax payment agreement is required for naturalization. IRS not USCIS collects and enforces tax laws. USCIS role in...

You make the initial selection on I130 form of where to send completed form. Subsequent selection(s) are made by USCIS based solely on its criteria.

You do not have any immigration issue in your question. It's unclear where to refer you.

I agree with the immediate above assessment. Retain an immigration attorney for further development of your cases and your options.

There is no clear direct immigration issue but consult with an immigration attorney to provide specifics of your concerns and expectations. Good luck.