A friend of mine has catalogued her experiences raising twins on her blog. It's a hilarious read, but actually very realistic. Be prepared -- adolescence in Argentina is nothing like the UK! However, I'm not sure if it's in the following post or another that she talks about the group mentality and that's very true, friendships are extremely important here and they look out for each other. She also gave a Ted talk (in Spanish) that is interesting:
https://othersideofthefence.wordpress.com/2013/10/25/set-your-alarm-for-5am-parents-guide-to-ba-teenagers/
https://othersideofthefence.wordpress.com/2013/10/25/set-your-alarm-for-5am-parents-guide-to-ba-teenagers/