The thing is pretty much never used because no one in the house plays piano... I don't even know when it was tuned last -- though, it still sounds fine. That's how little we use it.
My sister has a ten-hole ocarina and my brother has a harmonica, but, again, they don't play them.
My grandfather played violin, and we have two of his violins up in the attic... one's an antique -- almost a hundred years old, I think -- and the other is... ah, I can't remember. Might be fifty years, might be twenty-five. Not sure.