I've never had a good answer for the cliche, "If you could have five people (living or deceased) to dinner, who would they be?"
I would like to ask my grandma what stitch she used for the half complete afghan I want to finish.
I would ask Clara why she married Charlie the second time.
I asked my grandpa the questions I had. The best advice he gave me was that it takes that real strong feeling for someone to keep a marriage going (both of you). You could get by with almost anything if you had that.
I'd ask my other grandpa how he kept his african violets so nice. I have instructions, but I just can't seem to get them as healthy as his were.