You know, unless they explicitly say who's from what, I'm going to think that the writers are smug behind the idea that not giving us grandparents' names will keep us guessing. I'm guessing, however, that they want us to think there are different grandparents while in reality something happened to make Junichi a lucky bastard who really grandfathered all the girls. Except they won't tell us. That's what I'll believe, anyway, until told otherwise
. Or maybe it's Sakura's magic or something that's behind DCII
.
How about you guys?