How Harry and Hermione evolve into James and Jane Black

"The last thing I remember about Hermione, seriously?. Well she survived the war and everybody had their happy ending." The man says to himself: "Then again, it's still a bit blurry. What did happen last year?"..."What's this?" Harry stares at one image, on the picture a set of triplets is smiling back at him. "I uh,Um. Who are these babies?. What do you mean they're my babies?"