I had a friend who was required to pay rent when she began working. She paid for her own clothes, toiletries, school supplies, gas and so forth. She was required to take her siblings everywhere, still no gas money from the parents and she maintained much of the chores. Her siblings when they started working did not have to pay rent. She had since moved on to college. This is wrong in my opinion.
I began working at 16 when i was given my first car. Wasn't great but it worked. I was given 1 month of free maintenance by my parents. I was then required to pay all maintenance whether big or small, gas, insurance, taxes and so forth. I bought most of my own clothes, special toiletries and makeup, special foods, entertainment and so forth. My paretns still paid us an allowance for doing chores. When I graduated I was told I could go to college and live in the dorms and they would pay for it, meal plan and all. Anything other than that I forked up for. Or I could live at home rent free as always as long as I was a full time student. If I chose to move into my own place I had to pay for it all except tuition if I continued to be a full time student.
I think my parents have been very fair and they do help out when I need some $$ on occasion. But I must pay them back in full and maintain good grades. Anything less than a C- I pay back the tuition to them. I've learned my lesson on that one.