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[There's a face that's familiar. She sees it often whenever her mother takes her to see father or whenever she sees him in memories exchanged by blood. Yet Ai knows that this isn't the man frozen in time because she's seen him - the man who gave birth to her mother and raised her father.
Only memories of him exist for Ai but she recognizes him just the same. She doesn't know if mother has explained things yet but Ai can't ignore him either.]