Board Thread:General Discussion/@comment-6192846-20160323181002/@comment-146.113.65.245-20160525045056

He's not dead, certainly, but there's no guarantee he's going to answer every single question people send his way about minute details in the story. Especially ones as trivial as this.

The character is barely a passing mention, I hightly doubt we're going to get any more information on this. Is it really that big a deal? I wouldn't even call him a minor character, he's more a plot device to answer who took care of Rin while she was away. I don't see why we need more clarification than "she stayed with some people in Kai's hometown (one of whom may or may not have been a grandfather)". It's certainly not the backstory/plot relevant biological grandfather because that wouldn't make sense.