Is anything known about Saitama's family? I've watched season 1 and 2 of the anime, read part of the manga, read part of the webcomic and watched at least some OVAs (not sure they were all of them). I dont remember anything said or shown about Saitama's family. Is anything known about them? Also , aside of those sources, I know there are audiobooks, that there is an official encyclopedia, and that sometimes the author and the artist answer questions from the fans in an "official" way. 

Is anything known about Saitama's family?
To this date, we have no info on Saitama's family. Not even in the webcomic. However, there is a big controversy/theory about this and that is:

Spoiler from manga/webcomic: 


   Blast, number 1 hero, being a relative of Saitama. However as I said, this is a fan theory.