What should I do?

[Pluto]

Many ****ing times, she just insults me (which doesn't really do much, she's terrible at it) and all around acts like a *****. And now, she's reached the limit, she passed the negotiation part and she's now at "violence".

Tell your brother to stop being a b*tch and stand up for himself.

These things don't go away if you don't do anything about them.

I'd tell her to f*ck off and eat a d*ck, usually works.