They have charged me for fees that are a surprise on my statement - and when I ask them about it - they claim that my last account administer (who has since left the company) told them that I had approved it but never did the due diligence of double checking with me. 

It's those maniacs that buy homes cash via quit claim deed off of craigslist that really get screwed.Make sure your property manager is a licensed real estate brokerage.Google Clayton Morris fraud and/or Morris Invest fraud for a cautionary tale of what not to do when buying turnkey real estateUnderstand you can not eliminate all risk, only mitigate it.

We are also currently house hacking our SFH, renting out rooms, claiming everything on schedule E as we should, getting to deduct our mortgage interest and depreciate our house.

Theoretically, if all that has been done, and he doesn't rent you the unit because your brother told him not to, you could sue him in small claims court for the cost of moving your possessions to storage and a hotel room. 

And expect the underwriter to ask for docs supporting some of those claims. 

As it turns out it was a "friends" credit card and so they filed a fraud claim and the money was then pulled from our accounts.  

Hi my tenant currently has $500K coverage on "personal liability" but only $5k medical coverage.

One additional question, if you have any claimed in the past is it retroactive? 

Do we all claim it on our tax form for the full amount?

Or you can hire an attorney and attempt to evict just her but that can be tough to do if she fights and claims her parents invited her in.