User blog comment:Akakitsune98/Does Rin know that Mephisto and Amaimon are his half brothers?/@comment-9756677-20150811142221

Probably not! Even after he noticed he is a demon king, Rin didn't even know it was a thing everybody knew even though Mephisto said so! So, if he doesn't notice half of what someone tells him, I'm sure Rin won't also make the connection between the title demon king and Satan XD It would be funny if Mephisto, Amainon or even Lucifer called him "little bro" and he made a confused face lol