Currently it is oil heat.

Is there a heating vent in this room or a door that shuts it off from the rest of the heat source?

That said you really have to consider the location/area the property is located in as well (ie. extreme heat, severe thunderstorm season, heavy windfall, etc). 

But the brother or the son rather gave me a literal laundry list of things that needs to be done to the house such as the roof has leaked into the attic and then cause structural damage behind the walls also that there used to be a oil tank where are there currently is a concrete slab next to the house that was used to heat the house I hooked up to the furnace but now it's only a gas furnace but that doesn't even work and they're worried about turning it on because it does leak and you can't really open up the windows to vent it out except opening the door itself and getting out any fumes that would stay in the house.

The house that my wife and I currently live in will be a short term rental within the next few months, however we have one big issue: I can't solve our hot water crisis!
About 6 months ago our water heater worked ver...

What is the condition of the roof, plumbing and heating?

Selling the house was a plan, but with 60k in debt over it, selling at even 25k without a heating system isnt goong to help me get dents under control.

And heated floors in the bath room. this house will run on 50% less energy.. that would attract tenants I would think. 

I heard of one cutting a hole in the living room ceiling and roof , then had a  bon fire in the living room for heat, using the kitchen cabinets for wood.

The huge thermal mass of the brick is what slows down the heat/cold transfer.