Yes, video games are my primary hobby. At this point, they are also an escape mechanism into worlds that I can actually run, jump, shoot fire out my ass and lop off heads! Since my thing are RPG's, I can also enjoy creatively decorating my home to my own standards, knowing someone else will not wander in to drop piles of clutter on every flat surface. I can usually craft my own weapons and armor, choose my own path through various quest choices, and otherwise be in control of at least one small facet of my life for a few hours every week!
Good on your grandpa, lol, but not everyone has the options to jump on a treadmill or take a brisk walk outside. My personal comfort zone extends only as far as my oxygen tube, and required trips outside are frustrating, painful ordeals.
So I'm actually not the least bit ashamed of being a habitual gamer; I have been for nearly two decades, even before I became ill. My current loves are Dragon Age: Inquisition and Skyrim. I'd been breathlessly waiting for the new Mass Effect release, but the reviews of bugginess, complaints about inability to customize characters with faces that don't look cardboard have me kind of skittish about getting it until some significant patches are released. I haven't actually been able to learn much about the next Elder Scrolls release, but I sure hope one is on the drawing board!