Since you claimed your son as a dependent then you would amend your return and add the 1099-Q to your tax return. See below on how to amend and where to enter your 1099-Q
The statement about claiming a dependent than I need to add 1099-Q on my tax return - is this true as well if a grandparent was the owner of the tuition plan? In other words, I claimed my daughter as a dependent, she will be filing her own taxes as she worked part-time in 2016 and may be due a refund, but her grandparent owned the education savings plan. The 1099-Q does have her name and SSN on it though. So, does she enter the 1099-Q information, her grandparent, or me (since I claimed her as dependent)? Thanks for your help.
If you are claiming her as a dependent then you would file the 1099-Q on your return.