Do I beat her up or stay out of it?.?

Ok sooo muh brutha baby mamma is drama. She lied in said he choked her in he got locked up fuh 3hours. She get child support but yet we have their son every day all day. I'm tired of her usen my brutha and tryna play us I'm fed up and ready to whip her *** rite about now,..she 23 and I'm 18 what do I do kuz I'm very temptedd?!.