My grandmother passed away last night and I was able to be with her.
Canceling our trip, which seems completely trivial now, was the best decision. I would have been boarding the plane and cannot imagine having to either walk away from the trip at that moment or enjoying myself at all should we would have went.
She was 92, had dementia, and struggled for the last few years. Seeing her in her last few moments was agonizing but we were all at peace as soon as it was over.