Is it advisable to start legal process to evict them ?

I do however encourage immigration, it just needs to be done legally and intelligently. 

@Gulliver R.You got me researching legal conforming and legal non-confirming. 

Now, I am doing more of asset management and capital raising on top of being responsible for legal due diligence.

The rest you can handle from an hour away.Do yourself a favor: buy "Every Landlord's Legal Guide" by NOLO.

In addition to all the points above - continue to educate yourself and surround yourself with those doing it at the levels that you want to get at.I don't know what your family business does, but if there is a way, find creative, legal and non-invasive ways to leverage that to build connections and expand your sphere of influence. 

@Tiffany Tran This question seems pretty location specific since every municipality has their own rules, I would recommend reaching out to someone who specializes in Philly, or perhaps posting in the classifieds asking for legal help in the Philly area!

@Michael Baum thank you so much for sharing your thoughts; in regard to draining them, if it was just water, what are you thinking would be the legal concern?

Are you going to learn all the state and local ordinances to protect yourself from legal mistakes? 

The legal status of the PM is that of the owners agent.