Sorry, but no. Only 1 Federal return can be prepared per Online account. If you try to prepare a second one in the same account, it will overwrite the first one. You can set up a new account to prepare a return for your son. Depending on the complexity of his return, he may be able to use the Free Edition.
You can use the same email address for notification purposes in up to 5 accounts, but each User ID has to be unique.
FAQ: How do I start another return in Online TurboTax?
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...
NOTE: Also see the information in my next comment that follows below if your son's only income is unearned income.
Sorry, but no. Only 1 Federal return can be prepared per Online account. If you try to prepare a second one in the same account, it will overwrite the first one. You can set up a new account to prepare a return for your son. Depending on the complexity of his return, he may be able to use the Free Edition.
You can use the same email address for notification purposes in up to 5 accounts, but each User ID has to be unique.
FAQ: How do I start another return in Online TurboTax?
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...
NOTE: Also see the information in my next comment that follows below if your son's only income is unearned income.
@ nursecarlson711
Here's some additional info you may or may not need, depending on the nature of the son's income and the route you take. If this doesn't apply to your situation, then just ignore it.
You didn't mention the nature of your child's income; i.e., whether it's earned income from a job, self-employment, etc. or if it's unearned income (interest, dividends, investment gains, etc.) If it's unearned income, here's some info on the "Kiddie Tax" if you go that route.
FAQ: What is the Kiddie Tax?
FAQ: How do I report and pay the Kiddie Tax on my return?