If you get a chance and he's up to it, take your father somewhere before he dies, somewhere he has always wanted to go. I took my mother on about 1 trip a year for the decade before she died, and a couple of times I couldn't go but I paid for her ticket to Texas to visit her sister and brother. I took her to NYC, Niagara Falls, the Smoky Mountains, Boston, Cape Cod, and to meet her newest great grandson (my niece's little boy). She could not afford to go to any of those places. I had to scrimp and save to do it and I managed to get some of my siblings to pitch in and help pay some of her bills since she had to take off work (yes, she worked right up until the time she went to the hospital).
Now two of my sisters want nothing to do with the rest of us and though I have reached out, they won't respond to phone calls, emails, or texts. They already lived in different parts of the country, we all are spread out across the US. One of them is just aloof, the other one has gone crazy and just says the meanest, most spiteful things to the rest of us, including her own children.
I hope you never have to deal with that.