A nice story, and if your grandfather left it to you it's a nice link with the past. Keep in mind that not every motorcycle on the planet has to be restored and ridden right now - there are other possibilities. Before you decide what to do with it, it would be worth deciding exactly what's there and what might be done with it. It may be possible, for example, just to reassemble what's there and keep it as a display item for a while. It might grow on you (in which case you might restore and ride one day - serious fun) or it might leave you cold in which case you could dispose of it. Best not to be hasty at the moment! When you get the cance, take photos and we can comment further.
Leon