You have met this grandson, so that's a good place to broach the topic. If there is no one you are aware of, I would contact the county Aging Council. My understanding is that every county in the US has one, and they are Federally funded. I have had so much contact and support from more than one, and every time it's been amazing.

One way to open that discussion is "Let's make sure you have the specific team and support for your needs, as we discuss this complex topic with you. Who would I make sure is included?"

Even for hospice, I like to use a version of that phrase "special team" so they understand everyone is on their side and in it with them, not for them.