You don't add your son's income to your return. If he is required to file a tax return he would check on his return that someone else can claim him on their tax return. You would have to create a new account for his return.
How do I add a dependent's W-2 to my return?
https://ttlc.intuit.com/replies/3302077--------------------------------
Do I need to file my own taxes if I'm a dependent?
https://ttlc.intuit.com/replies/3302185
