Firstly, sorry to here that, hopefully nothing too serious, at least if he's in hospital at least they'll be able to react to the test results swiftly. If I can be of any assistance, just shout

Secondly, that's a tricky one, and from bitter experience an issue that can split families

(very)Short term, get over to your parents house, via the hospital, if that's where your Mum is currently. Get her and the pets fed, then wait to see a) what the tests say, and b) what the next step is wrt your Dad.
What happens long term depends on alot of variables, but first up, if noone else is prepared to, infact regardless, take the initiative on this, sit your Mum, and Dad if he's able, and have a serious conversation with them. Ultimately someone will need to move... this might be easier if it's both parties

Make it a mutual compromise rather than a 'You must move to the bungalow next door', that way you can combine your efforts into finding a better suited property for all your needs without it being an ultimatum.
Joking aside, if the bungalow next door is on the market or is a rental property, then it has potential.
Whatever decision is reached, include your siblings, keep any financial arrangements transparent, this should help prevent any animosity that usually appears when family, responsibilities and finances are put in the same sentence

One way or tother, someone needs to be closer in the long run, and it will undoubtedly be logistically better for your parents to move somewhere more central. If your Parents are adamant that they won't move, then you'll either need to accept this and work around it as a family, or move nearer, both easier said than done. Someone should probably be in their car by now though
