Again, took way too long to share my thoughts on this, but this was a really good episode. The idea of Lisa wanting Pop-Pop to be around forever is understandable, given she's young, and the episode did a good job showing more interactions between the two. It also has a good moral of enjoying the time you do have with your loved ones, and not taking it for granted by wishing you had more. You know, I've always kind of envied people with grandfathers, since I lost both of mine when I was 14, and both of them passed away within five weeks of each other. So, I'm definitely all for the message that you should cherish every moment you have with them.