Yes. From the instructions for form 8949:
"You received a Form 1099-B or 1099-S (or substitute statement) as a nominee for the actual owner of the property..."
"Report the transaction on Form 8949 as you would if you were the actual owner, but also enter any resulting gain as a negative adjustment (in parentheses) in column (g) or any resulting loss as a positive adjustment in column (g). As a result of this adjustment, the amount in column (h) should be zero." Enter code N in column (f).
For how to do this, in TurboTax, see: https://ttlc.intuit.com/community/business-taxes/discussion/how-do-i-enter-nominee-amounts-on-schedu...
EDIT: I’ve been advised that code N can be entered on the Capital Gains (loss) Adjustments Worksheet.
Check the nominee box (code N) and enter the adjustment amount in Part III Specific adjustments.
Direct entries on works sheets is only available in the download/CD versions of TT. You can’t do it with online TT.
As an aside: you seem to have set this up wrong. A UTMA account is usually set up with the child's SS#. When the child reaches age of majority the account goes only in his name, not a joint account with the parent.
