Sorry for your loss , i think its a part of grief to torment yourself over not realising a loved one is ill! Im sure your Dad wouldnt want you to feel like that- Presumably he knew?!! My Father took ill in 2021 but the signs were obvious 2 years prior - i did think he had Cancer but my Mum & siblings either thought i over worry( which i do sometimes) tremendous weight loss & withdrawal, this ended up collapsing with a ruptured bowel tumour? He hung between life n death spending 13 weeks in hospital ( lockdown) .. He had an iliostomy & got lifr slowly back on track- driving ect- until 3 weeks ago- Cancer is back & in liver also , home from Hospice & its a waiting game sadly... Try & remember the good times - nothing will come of you giving your self a hard time- sometimes were too close to notice xxx 

Sorry for your loss , i think its a part of grief to torment yourself over not realising a loved one is ill! Im sure your Dad wouldnt want you to feel like that- Presumably he knew?!! My Father took ill in 2021 but the signs were obvious 2 years prior - i did think he had Cancer but my Mum & siblings either thought i over worry( which i do sometimes) tremendous weight loss & withdrawal, this ended up collapsing with a ruptured bowel tumour? He hung between life n death spending 13 weeks in hospital ( lockdown) .. He had an iliostomy & got lifr slowly back on track- driving ect- until 3 weeks ago- Cancer is back & in liver also , home from Hospice & its a waiting game sadly... Try & remember the good times - nothing will come of you giving your self a hard time- sometimes were too close to notice xxx