When you file your 2021 tax return you will each reconcile the amount of advance child tax credit you received against the amount you are eligible for. There is no such thing on a tax return as claiming one and half children, so one of you will be able to claim one and one of you will be able to claim two, or maybe one of you will claim all three---depending on who was the custodial parent and whether you have a signed agreement as to who claims the children on the next tax return.
If you get too much in advance you will receive less with your tax return. The amount you get is the same---it is a matter of WHEN it is received.
If you want to un-enroll in the advance payments go to Manage Payments.
https://www.irs.gov/credits-deductions/child-tax-credit-update-portal
https://www.irs.gov/credits-deductions/2021-child-tax-credit-and-advance-child-tax-credit-payments-t...
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