Seller Still Occupying Property at Closing

[Fan Bi]

Over the course of the past few months, my wife and I found, inspected and financed a triplex in the Providence, RI area. The final walk-through was scheduled for 9/9/16 at 9am, with the closing at 10am. When we arrived, it was quickly evident that the seller and family were still occupying all three units, and had made no intentions to leave.

We asked the listing agent about the situation, and he was both dumbfounded and lacking in communication. We subsequently went to the agreed-upon lawyers office to close (and hopefully understand from the seller's attorney what was going on), only to find out from the seller's attorney that his client requested another 60 days. 

The damages are time planned off-work for fix the property for an October 1 rental date, cancelled contractors, but most of all missing an October 1 rental date which puts us in risk of having extended vacancy through a New England winter. 

Are there any attorneys or real estate investors who have seen or experienced anything like this?