And the police won't say if the arrestee is the stepbrother or some other 15 year old. Who do the cops think they're kidding? May as well release the mouse's name. We all know it's the brother. And judging by the pic of the girl, she does not look well-taken care of, which wouldn't be surprising, given that her mother was clueless to the point of having no idea she was dating a man whose bad parenting made his son a killer.