It depends upon how the interest income was treated by your father. I realize this may not be practical as it has been many years that have passed.
Essentially, your treatment will probably follow the accrual method as shown in the link below, where you report the interest income in the year the bond is cashed. Since your father passed away several years ago, I am assuming there is no longer a trust filing requirement.
If so, the income will be reported on your 2021 income tax return since you have just cashed them out.
Please see the link below for additional information.
Reporting savings bond interest for a deceased taxpayer
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