Amanda,
You don't say if your father will be getting chemo or not, but many people have problems with nausea from pain meds and chemo. While YOU may be able to drive 3-4 hours a day with no problem, your Dad may not be able to ride that long 5 days a week especially toward the end when energy wanes. I think you ought to try to find a place for all 3 of you to rent or stay for at least the later part of treatment. The first couple of weeks, you could try to commute Monday and Tuesday, stay over Tuesday night, go home Weds night, stay over Thurs, go home Friday but that might even be too much after the second week. I'm not certain I would want to ride 4 hours a day, 5 days a week for 8 weeks, even if I were perfectly normal and not getting treatment. The price of gas and wear and tear on the car alone has to pay for most of a hotel room or small apartment. Maybe the hospital or cancer society can help you find a place near by. It doesn't have to be in town.

Take care,
Eileen