Besides, I seriously doubt your 17 year old can even come close to having provided more than 50% of their own support. So your 17 year old has to select the option for "I can be claimed on someone else's return" unless they can prove to the IRS they provided more than 50% of their own support. If the 17 year old lived under your roof for the tax year, then there's no way they provided more than 50% of their own support.
