Most do eventually settle as the hormones settle down, but it sounds like there could be something else going on there too - I haven't raised my own teenager yet, but my XP's son was pretty difficult at that age. How is his school life going, has he got plenty of friends or at least hangs out with people, or is he quite withdrawn? Does he participate in any sports (also good for redirecting excess frustration/aggression due to horomones) or outside school activities?

Does he have an older male role model who can step in and let him know he's being a tool and making life harder for himself? You do need to be able to pull rank and let him know that his behaviour isn't acceptable, especially the violence towards his little sisters but I know that's always easier said than done - hopefully someone with a bit more experience than me can give some advice here.

hang in there hon, it's a tough ride.