Yes you can find more information at:
https://www.irs.gov/newsroom/questions-and-answers-about-the-third-economic-impact-payments-topic-g-receiving-my-payment

(Updated 2/5/2021) All or part of your refund, including any amount for the Recovery Rebate Credit, may have been used (offset) to pay off past-due federal tax, state income tax, state unemployment compensation debts, child support, spousal support, or other federal nontax debts, such as student loans. To find out if you may have an offset or if you have questions about an offset, contact the agency to which you owe the debt.

We also may have changed your refund amount because we made changes to your tax return. This may include corrections to any incorrect Recovery Rebate Credit amount. You’ll get a notice explaining the changes. Where’s My Refund? will reflect the reasons for the refund offset when it relates to a change in your tax return.

Tax Topic 203, Refund Offsets for Unpaid Child Support, Certain Federal and State Debts, and Unemployment Compensation Debts has more information about refund offsets.

No. Your second payment will not be offset for any Federal or state debts.

Referenced from https://www.irs.gov/coronavirus/second-eip-faqs

Per the federal legislation, the thrid round of COVID-19 stimulus payments are NOT subject to interception for past due child support.  If you have any additional questions, please contact your area child support office.  You can find your nearest office on our LOCATIONS page. 

No, the second round of Economic Impact Payments, authorized by the American Rescue Plan Act of 2021, are not subject to offset for any reason through TOP.

Referenced from https://fiscal.treasury.gov/top/faqs-for-the-public-covid-19.html