Already a co-owner of  single family home with shared common space and bedrooms rented to individuals.  

I'm about to graduate college with a finance degree, I'm looking to get into real estate and possibly flipping houses.

Of course blaming me, complaining about other people, talking about her medical issues and son and how they need a place without stairs and need to move, and on and on.How are other landlords handling this?  

You are subject to failure to file and failure to pay penalties.

I did this last year and it was awesome. 

and are all you wholesaler's cold calling?

They are now getting divorced and he is moving out. 

At first, I thought it was a joke and now I realize it's not.   

My squatter is savvy and knows how to prolong everything.

and what owed in the HELOC used to buy it?