Hanging Bell - Owl
Grandparents play a special role in the lives of their grand children, not only are they the go-to people when parents scold their children but they touch the hearts of the young kids in a way that is only unique to them. This is why the Hanging Bell - Owl would be the most adequate gift to give to your grandparent.
Joke with them as to how the alerted ears and big eyes of the animal remind you of the time spent on their country house and how the sound of the bell take you back to the day when they let you milk your first cow. And then you should add that you bought the item in pairs, as you have one exactly just like it back in your city apartment. Now, which was the better gift again?