Hi, I'm not actually a parent but some late-night research led me to this site; I was trying to find out if there was something 'wrong' with my 16 year old brother based on behaviour that my mum and dad have often just attributed to "growing up" or being the only boy in a family of three sisters. For a long time, my brother has been aggressive, abusive and sometimes even violent, depressed, addicted to the computer, rude and stubborn. He is really good at sports/athletics though and I think maybe this could be used to let out some of his aggression. I also read another post that mentioned that their child does not act in the same way outside of home, and this is true- my brother can be polite, restrained and really nice to other people outside of our family, and even with the family too. Small things can change his behaviour and make it really unpleasant, to the point of scary, for the family. I'm sorry that this is such a long post and thank you to anyone who reads or responds to it. I was wondering if this kind of behaviour could suggest a behavioural problem such as ODD? And how could I approach my parents or my brother in getting him diagnosed? Often it is so easy to be lazy about this kind of thing because when the fighting has died down it is much easier to pretend it's over for good and that it won't happen again. My parents have been saying "we've had enough" for years. Does anyone have any advice or anything at all that could help me? It would be really appreciated!