We almost meet Jack's dad here! I hope we get to properly meet Grampy and Grammy Nelson soon~
There are some fun things I want to do involving Grampy Nelson and his relationship with Jack (and Hana), but I don't want to say much more!
If you haven't seen the links, there's an RSS to Otaku Dad, as well as a Facebook page. They're both pretty good ways of keeping up to date with the comic~