Tough situation.
Heres something to consider.
Hip fractures (typically from falls) are a death sentence. Especially in someone who is over 80 and has cancer. Most don't make it past 6 months.
So, a starter could be, "hey pops, I've been thinking about that fall.....do you know that if you'd broken your hip, we'd be talking about final arrangements very soon? How about we talk about where we go next?"
