You don't want the last moments you spend with your dad being something negative, with what time he's got left try and make the best of it. Differences and all aside, he's your father. I can't say I know what's going on or anything but I'm sure you don't wish this upon him and want him to go in peace. CAG isn't going anywhere so do what you gotta do. Best of luck and my condolences.
You should enjoy the little detours to the fullest. Because that's where you'll find the things more important than what you want.