Son or Father Not Responsible but 3rd & 4th Generation

Question details

There seems to be somewhat a contradiction between what God says in Ezekiel that the father nor the son are responsible for each other's sin, but yet then it says the iniquity of the fathers will be visited to the 3rd & 4th generation. How do you harmonize these? [Ezekiel 18:20, Deuteronomy 5:9, Exodus 20:5]

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8:23