@Bootybug having adult do the scolding more effective than having another child doing it,
if another child they just got more angry instead since they think other child more superior than them...
@Bootybug She can't talk properly as a little kid, which would take the edge off the scolding. It's been mentioned a few times but doesn't really show in the dialogue, not sure if that's the writers' choice or if it's being lost in translation.
So, first time i saw her slap him i didn’t realize he had slapped her too and i was like “over the top much?” Then i re-read and realized he slapped her. Also im worried she might cause him to develop a masochist complex and older sister fetish now...