I myself am not looking forward to handling a dying relative so you have *all* our sympathy and support in this difficult situation. Even though we're all likely to find ourselves in a similar situation, actually having to deal with it is an entirely different experience altogether. Just hang in there and do what you have to do as that's all anyone can ask.
As for the golf crossroads, definitely take a lesson from a local pro. Ask around at you local course or driving range for recommendations. It will definitely give you something specific to work on and don't like that particular instructor, move on to another. No big deal.
Golf is a social game. Note *social* (with other people) and *game* (supposed to be fun). Join a league, find a golf buddy, or just intentionally play with other people and find out how to enjoy it and connect with the people you're with. We all suck some days and play out-of-our-minds once a month. One thing I did to make things more fun is to just play: no scorecard, no pressure, just one shot at a time. Right before every shot I'd look up and just take in the whole scene and then take a crack at it and let the chips fall where they may. This really put the whole thing in perspective for me.
Hope you can find the thrill again..