Board Thread:General Discussion/@comment-25301131-20150302004409/@comment-26035847-20150413173054

QuasimodoBellringer wrote: I am surprised that people didn't belive this theory. THere is one little detail, that is VERY obvious that means it had to be true. He is their great uncle. Therefor the brother of their grandma/grandpa. Just be being their Grunkle means he HAS to have a sibling.

Well yes he had to have a sibling, but it was up for debate whether his sibling was dead, or just nothing special at all, or if it was even beneficial or any part of the show.