Start with high-confidence holocaust for kids books, then narrow by subgenre or adjacent topics.
The Daughter of Auschwitz
Tova Friedman
Along the Tracks
Tamar Bergman, Michael Swirsky
Yellow Star
Jennifer Roy
The Girl Who Sang
Estelle Nadel, Sammy Savos
The Librarian of Auschwitz
Antonio Iturbe, Lilit Thwaites
It Rained Warm Bread
Gloria Moskowitz-Sweet
The Einstein Vendetta
Thomas Harding
When the World Was Ours
Liz Kessler
Never Silent
Setsuko Thurlow, Kathy Lowinger