@Thomas Smothers it sounds like the seller is bluffing and can't enforce what he wants you to do. 

I bluffed and told them he needs to move out, but do I need to formally evict just the son?

Most people are bluffing when they threaten lawsuit.

I'm certainly not a lawyer (so I could be off-base here), but common sense tells me that there probably isn't a law that says that if he doesn't receive a copy of the lease, he is allowed to violate it.This is exactly what I was thinking, so I did a little bit of research and he was just bluffing and there's no such thing as that in the state law.

They also agree he may just be bluffing, and without a contract it's a lot of he said she said so really it comes down to what the value of his work is worth (which is NOT $2,100 especially when work isn't complete).

BLUF: Worry less about marketing your business and more about having quality houses/apts to rent that are listed on major public websites.  

Could be bluffing...or not.

I don't think he's bluffing because he said he could get the money within a week and has been a good tenant thus far.

In the end, it seemed like a lose-lose... we left the ball in her court to see if she was going to pursue the cost for "damages" and put us into collections.. but the lawyer suspected she was bluffing just to keep our entire deposit, which she was.

It is bluff, bluff, and more bluffing from the bank.