I have DS (17) and DD (14).
They are not perfect by any means (the occasional back-chat that has to be dealt with as well as the odd bits of selfish/thoughtless behaviour around the house).
There is no aggression, violence.
DS is in Year 13 and his grades are looking good. He has been visiting Universities all over the country on his own, by train, to think about his future for himself. He is not the perfect student (everything is disorganised and last minute) but he has always had a great relationship with his teachers. He is also working part-time about 22 hours a week and sorts out his own meals around those shifts and cycles there and back himself, only asking for lift once when it was absolutely throwing it down with rain. I bought him a good quality set of waterproofs and he insisted on paying for them "But I'm working now Mum, don't treat me like a kid!"
We have had two phone calls since DD has been at secondary school which have been about her chatting in lessons. This is absolutely her character but we have been supportive of the school and have taken away her Ipod and refused her a trip to the cinema to make the point that we do not accept this.
There is small amounts of alcohol offered on special occasions which has never yet been accepted by DD but DS (17) had a Bucks Fizz last Christmas and did voluntarily tell us he'd had a bottle of beer one night in the summer when the rest of us were away. No alcohol goes missing.
Neither have yet shown an interest in the opposite sex or indeed sex itself, although I'm sure they have privately (iyswim).
Neither have disobeyed curfews or seem interested in going to the parties that go on.
Neither smoke and both consider acquaintances who take drugs to be "chavs" or "idiots" - their words not mine.
I think a lot of it is to do with their friendship groups. Both have brilliant sets of friends with similar behaviours.
I think it is also down to family/friends of family.
We have friends round and we drink quite a bit on those occasions but never to the point that we can't control what's going on. We like our music a bit rowdy sometimes but never so we disturb others or are anti-social to our neighbours. We don't use drugs.
No subject is taboo if they want to talk and we are truthful about our own failings and disappointments and times when we wish we'd behaved differently. I always apologise afterwards if I swear or get angry, for example.
If we disagree on a moral issue then that's fine, but we have a full-out debate and all explain our feelings.
Sometimes it's chaos here and everyone's annoyed with everyone else but somehow we get through it! We are very lucky and I am well aware that it could all go wrong at any time.