Lots of moving parts though.  

He has moved his daughter and son in law into the house without any notification or consent. 

Hi all, I need advice and help how to move forward. 

Even though the rate is good is the property right for your investment strategy and portfolio to move you closer to your goal?  

I moved here from Florida after seeing the projected growth.

Driving pilings, sea wall retention systems, special sewer containment systems, home security, building quality, stainless steel fixtures for salt, etc.  

This is what leads to the popularity of “live in flips” where you move in to the new property and spend 2 years fixing and upgrading the property before selling your primary home/flip tax free.

That isn't enough equity to move the needle now and since you are on a 5.75% FHA, your payments are probably still pretty high comparatively which might cut the ability to save more.

I have a job making ~ 90k and I plan on moving to Texas sometime in the near future.

That's the Miami spirit—always moving forward, even when the tides of change try to hold you back.