OK, here is the story. My DD(17) was invited by her friend to go to Six Flags over Spring Break(just a day trip). There should be 7 people all together, they have a big car. I was OK with that, I was taking girls to Six Flags before(much smaller group) and I would trust another parent drive all the way(4 hours total if no traffic). Yesterday, my DD told me that instead of father, girls brother (19 or 20, not sure) will drive. Now I am in doubts. The road has 70 miles limit and many cars drive even faster. I am afraid that a young boy will be distructed by all the OMGs from 6 girls, I could barely stand it when I drove them and I am not sure how long he is driving and how responsible he is, esp. on the way back, it will be dark. What do you think? Am I unreasonable or make sence. Would you let your child go on such trip? Please, I need some opinions. Thank you.