If you are getting the stimulus payments on your 2020 tax return by using the recovery rebate credit, that credit added to your refund. And......your refund is up for grabs by the IRS if you owe child support. They can and will seize your refund if there is an order for it.
When they sent out the stimulus checks in 2020 the first one could be seized for child support. When they sent out the 2nd ones----- if they sent it by itself----then it could not be taken for child support. But if you did not get it as a "stand alone" payment and instead are getting it as a credit on your tax return, it can be taken. Sorry.
TurboTax never knows if you have offsets to your refund, but the IRS is informed by the agencies that enforce child support orders.
Reduced Refund https://www.irs.gov/taxtopics/tc203
NOTE: You can contact the IRS Treasury Offset Program Call Center at 1-800-304-3107 to ask if they have an offset for you on file. TurboTax would not have that information.
Per the IRS:
A3. Yes, the 2020 Recovery Rebate Credit can be reduced to pay debts owed to other Federal government agencies (separate from federal income tax debt) as well as to state agencies. Keep in mind that the credit is part of your tax refund and your tax refund is subject to any offset.