@hanchobakery Grandpa didn't have to be the one who owned the console for it to have been in the storage shed. The house he lives in is a traditional style Japanese house, and those were usually multi-generational within a family. It's quite possible
his parents grew up there as kids, and maybe even one of his grandparents. It could have been his father's/mother's/grandfather's/grandmother's console originally as well, and was kept in the storage shed over time for sentimental reasons. Or just because it's useful to pull it and the stored games out for a new generation of kids. Even today, if all a kid has is an old NES or SNES, they'll play the hell out of it.