...to feel like disaplinning my brother isn't my job?

[babylove789]

I have a significantly younger brother. I no longer live with my parents and my younger brother but when I am with them, I see my mother let my 6 year old brother do things he really shouldn't eg, talking about things he shouldn't. It's difficult because my mother feels no need to disaplin him and I fear he could go to school and act badly there. I do try to tell him wrong and right, but always feel although it's not my buisness and I should save my motherly-instincts for my own kids?
AIMB to always tell him what to do when my parents don't?

please try to stay out of it

unless he's heading to hurt himself, ofc

they did a pretty good job raising you, yes? trust them to do same with your brother

Depends on what sort of things; for example racist language, torturing animals or other small children , then yes I'd speak up.

At the other extreme not tidying his toys when told, insisting on eating pudding first, then no.

"Disciplining" isn't really what is needed, but there may be situations where suggesting that if he carries on doing that it's going to lead to problems might be in order, but be prepared to be told to mind your own business.