since you usually need to provide windows equal to ten percent of the
finished floor space, and 45% openable, smoke detector, carbon monoxide
alarm, water alarm, radon testing, and a permit, and to supply fresh
combustion and breathing air into the basement as well as bathroom
exhaust, let's move the guests into the main floor living room or
nearby motel for now.
and buy dad some bean-o.
also look at the radon mitigation fans that collect radon gas from your
basement and constantly blow it up a pvc chimney.
see various fans at: