Quote from Kylash:
So right now I'm only 15, but I have an interest in trading futures (specifically ES) over the summer (when I'm not in school of course). My question is; would it be legal for me to have a brokerage account and trade under one of parents' names?
You might telephone or write email to a few futures brokers and ask how you might trade as a 15 year old. I suspect if your parent opens a custodial account then you may trade.