In 2008, Katelyn inherited considerable property when her father died. When Katelyn dies in 2020, her estate may be able to claim a credit as to some of the estate taxes paid by her father's estate.
Ray purchases U.S. savings bonds that he lists as "Ray and Donna" as co-owners. Donna is Ray's daughter. Donna predeceases Ray. No gift or estate tax consequences result from this situation.