Responses
Yes they are half brothers (same Alpha(?) mom).
Alpha mom had an affair with Miyauchi's Beta mom (a maid). Then she left them and married Jirou's dad. And later the mom and dad divorced.
Aaah okay thank you sm!!!
I've re read this like 5 times but I'm still a little confused about the whole family tree here lol. So are Miya and Jirou like half brothers or something? Bc I know they are blood related I just don't understand how...