The numbering of “popes John” does not occur in strict numerical order. Although there have been twenty-one legitimate popes named John, the numbering has reached John XXIII because of two errors that were introduced in the Middle Ages. First, antipope John XVI was kept in the numbering sequence instead of being removed. Then, the number XX was skipped because pope John XXI counted John XIV twice.
I don’t expect animated heroes to have uniformly ideal, harmonious family lives. It’s not realistic — and it doesn’t make for good drama, which needs conflict. The ubiquity of the pattern, though, is striking.