Angie,
I didn't read all the other posts b/c I am on quickly, so not sure if I am repeating. Just wanted to say that I am so sorry you have all of this stress. And this time of year makes it that much harder.
I have a feeling your dad just wants to make things easier on you in case the time comes. When my mom was diagnosed last November, the first thing she wanted, like ASAP, was her burial plot in CA. My parents had plots in NY, but my mom didn't want us to have to ship her there and go there, etc, so she wanted burial plots and left it to me to get the job done. On THANKSGIVING DAY last year we picked out the plots and bought them. It just gave her peace of mind that we wouldn't have to deal with it later on. So DO NOT look at it like your dad will need it now, he just wants it done to make things easier for you.
Hang strong. You are doing an amazing job with everything!