So glad it's still in the family and you will get a chance to see it!
I have a similar story....as a child I slept under a Sunbonnet Sue quilt made by my grandmother. It wore out, I assume, and my mother discarded it (she didn't quilt or even sew and was not a hoarder; she threw away -- threw away! -- the wooden ironing board that she'd had as long as I could remember, that I learned to iron on, and that she once told me my grandfather had cut down (the tapered end) to make it easier to iron my baby dresses on. She had a modern board and cleaning out one day, decided she no longer needed the old wooden one. I nearly expired when she told me she'd thrown it out! It's been years but I still wish I had that ironing board.
I also still remember the colors in the Sunbonnet Sue quilt from when I was a child and would give anything to see it again but it's long long gone.
So glad your story has a happy ending! I don't know the kinds of questions you should ask except the ones you've already thought of.....but be sure and take a good look at the handquilting. I'm so impressed with the skill of women who did that years ago.