Crappy story incoming...
Last year my mum needed a lung transplant... that went badly. She passed away after months in intensive care.
During that time Dad started having heart attacks. Both parents in intensive care at the same time.
Fast forward to now and dad is due for open heart surgery so severe that just a few years ago it wouldn't be able to be done. Double bypass, new valve and a couple of other things that make the operation difficult due to the amount of time the heart will be stopped.
I'm 24. Hopefully this is the end of all the illness in the family for a few years at least!
That's pretty rough mate. I hope your dad pulls though ok!