"The Eighth-Grade History Class Visits the Hebrew Home for the Aging" is a short story by Harry Turtledove, published at Tor.com on January 8, 2014. It was reprinted in the collection The Best of Harry Turtledove (2021).
It is a very narrowly defined alternate history story, with the sole Point of Divergence being limited to Anne Frank and her family successfully maintaining their hiding place until the liberation of the Netherlands in 1945. It might be better described as an "alternate biography", as broader history is not obviously changed by Frank surviving, immigrating to the United States of America, and raising a family of her own.
The story has the elderly Anne Berkowitz (née Frank) recounting her experiences to an eighth-grade history class from a local middle school at the retirement home where she resides.
"Cayos in the Stream," a story about Ernest Hemingway, which has some similarities to the "alternate biography" genre, but is a very different kind of story.