I would listen and follow the advice of my lawyer. Good luck.

No. EAD would be required for unpaid research followship.

The 3-year rule is based on effective date of LPR, and NOT your arrival in the US. From that date you must be present (physical and continuous) for...

As an LPR, there is no visa category to sponsor parents for US permanent residency.

The review process will continue until a USCIS officer signs off on your application you are OK for green card. In other words, the review may be...

Your statement is a little confusing as goes from derivative US citizenship to AOS on K2. You may clarify using nonlegal terms.

In theory, your fiancée may have problems with a tourist visa because of K1 withdrawal. At th is point, you must consult with an immigration...

Determine the applicable income level below: 2022 HHS Poverty Guidelines for Affidavit of Support https://www.uscis.gov/i-864p

Yes, you may sue USCIS. Get a local attorney and good luck.

Unless N400 application is based on marriage. Otherwise, not necessary but you must disclose divorce for marital status.