It sounds like the daughter's boyfriend has moved in, and the dad wants to put him on the responsibility for the lease to make it more official, which seems very reasonable. 

As for the non-permitted work...well that would depend on your local building official to determine how much trouble you're in with that.

In your purchase agreement you need to make sure you have language in there clearly stating that all deposits and RTO will transfer to the new owner of the MHP. 

Well 4 years later, a few of them have done multiple deals because they weren't just official meet up attendees with no real money or resources, they were actually in the game because they emerged themselves in the world of real estate at the most entry level possible.

As someone who has never seriously looked before now, in officially one of the hottest real estate markets in the country, should I wait for a fall?

@Mark Page My official day job is a drug screen collector. 

I have been continuing to do research and a lot of it in Massachusetts seems to be the language used and how you represent the buyer/investor when making offers.

And make sure the language is clear that it doesn’t matter if seller has actually collected that months rents, they are to pay you the prorated rents.

Make a final payment after all punch list work has been completed and permits have been satisfied by the local building official.

I hope you guys understood what I was saying, because English is not my first language.