Gromble's unnamed sister, is a character mentioned by The Gromble. She is the only Gromble's sister as he never mentioned having any other siblings. She is the mother of Bomble and the daughter of Mama Gromble. This article is a stub. You can help your monster friends by expanding it. Retrieved from "https://aaahhrealmonsters.fandom.com/wiki/Gromble%27s_unnamed_sister?oldid=10463" Categories: Article stubs The Gromble's Family Characters Females Mothers Monsters Community content is available under CC-BY-SA unless otherwise noted.