I am so sorry for you loss holly, but I am also glad that your DF is now out of pain, and at rest. When it comes after an illness like his, I genuinely believe that our minds change from fighting death to almost welcoming it. Through losing both of my parents in a similar manner, and through nursing the elderly, I could see that not one of them seemed scared or unhappy about having reached this stage of life.
You were obviously a very caring DD, and you sound like a lovely person as well. I wish you strength for all the organisation that comes now, and for the period after your DF's funeral, which I think can be the worst time for the loved ones left behind. Sorry, but I can't remember how much support you have in your life, I hope and pray it is lots. But whether you do or don't have any RL support, please come back here for any extra support you may need or want - even if that is 6 months or a year down the line.
My DM died over 10 years ago, but I had spent the previous 10 years to that preparing myself for her loss, so I was able - when the time came - to mainly feel relieved that she was no longer in pain, or confused - she also had a Dementia. A few days ago it suddenly hit me that the one person in my life who always loved me unconditionally, who I could always turn to, has now not been in my life for over 10 years, I shed a few, of I suppose selfish tears, but I think we all have times when we should be allowed to be more focused on ourselves. Be kind to yourself OP, you are so important in your own right. Grief doesn't have a Timetable, and it doesn't always follow the often published order of grieving, so as I said before, please be kind to yourself, and come back here if you ever want to talk more about any feelings you want to share ❤️