The only thing I can think of for around 16,000 would be for giving someone a gift. If you give anyone a gift of more than 15,000 in a year you have to file a gift tax return.
Are your brothers filing tax returns too? Even if you don't amend to be independent the IRS should see that you made too much to be claimed. Did Turbo Tax let you file as a dependent when you had too much income? I'll have to check that out and see if it gives you a message.
