Don't worry about his condition it doesn't seem too terrible. I know a close friend who has a out of place colar bone from biking. Road rash sucks, which seems is what your brother got as well. Just make sure you give him a lecture or stern talking to; you can't stop him but you can motivate his actions, I remember being irresponsible when drinking at the age of 14, and I would constantly black out and whined up in someone elses house. Sometimes I had bruises and a needle that I was told was stuck in my hand after falling over a table that wasnt supported. I learned from my mistakes and drink the most responsible in every party I find myself at.