i'm so sorry to hear about your father, and i also send my best wishes.
i've been in a similar position, i guess. but not with a family member as close as a parent. here's my stories, although i'm not sure they're at all helpful...
my uncle, a head paediatric oncologist at a prestigious children's hospital in New Zealand and father of 4 young kids, was diagnosed with bowel cancer about 3 years ago. it was such a slap in the face, considering he's spent most of his life treating children with the disease, and is the most fit (he's always training for some different marathon or triathlon) and healthy person i know. luckily, they caught it early and a year of torturous chemotherapy seems to have "cured" him - well, he's in remission. i remember being at his house just before christmas last year, when he was due to get his test results back. he said he didn't want to know, because if the cancer had returned then he'd rather not know until after christmas. my aunt, who is also a doctor, wasn't coping at all with that decision and they eventually decided to find out. and thankfully, it was all clear.
and then about... 4 months ago, my grandfather's voice started to get very hoarse. the doctors diagnosed him with laryngitis, but my aunt (who had gone through the bowel cancer scare with my uncle) wasn't convinced. so, he finally agreed to go for a scan and they found tumours in his throat, lung and brain. they were almost certainly caused by his 50+ years of smoking. the doctors said he had 6 weeks, at the very most. he deteriorated rapidly, and the tumour in his brain caused him to become so delusional and dependent that he had to move to a nursing home. he passed away about 3 weeks ago, with all his family by his bedside. and i couldn't even attend his funeral because i had exams.