Don't know what to do. Think is definitely down to hormones, but son is trying to act like a tough guy. overly agressive to parents and siblings at home, telling lies and apparently same at school - except not to teachers. Don't want 'to go down the come down on him like a ton of bricks' route as tried that with my now 24yr old daughter when she was his age and it was just a downward spiral and gradually got worse in her teenage years. Seriously need advice and any ideas of any kind of specialist who could advise me on how to react to his behaviour and how to try and change it? His 4 and 5 year old younger brothers are starting to copy this behaviour -HELP!!!