Parents and Cancer

A few weeks ago I found out my dad has cancer. Two tumours in his bowel. This is totally curable, if he'd been to the doctor a year ago that is. As far as I can tell, he should be able to get over this with some chemo and an operation to remove part of his bowel.
The prognosis is good, however, he has to have all of this done here, in Melbourne. Whilst I love my parents dearly, they are so much easier to love if they are in different states. My mother is a bitch to my dad, and he is a prick right back. Neither of them hear so well, and my mum won't wear the hearing aid we bought her, so they yell all the time, and the TV is so loud it shakes the pictures on the wall.
Neither me nor my brother want them to stay with us. I feel really guilty, they'd never turn their backs on us, so how do we get around this with out having their awful angry presence rub off?
Dad has to be here for 5 weeks while he has the chemotherapy, then they wait for a bit, then they remove the part of his bowel with the tumours. That's going to take over 3 months, and I think I'll end up going crazy if I have to have them in my house for that long. Luckily I don't have a partner, they would run a mile if they had to put up with that for more than a week.