I read this a few years ago, and it was really very interesting. One thing that would be disturbing for ten year olds is once again the description of the Russian occupation of Berlin, as they basically set out to rape the city. Eleanor's Story: An American Girl in Hitler's Germany by Eleanor Ramrath Garner
From amazon-
One of Garner's haunting childhood memories is the sound of knocking coming from the rubble of newly bombed buildings in Berlin, where she and her family spent the war years. She feared the sound was from doomed victims signaling for help, which could not get to them in time. In this stunning memoir, Garner tells the survival story of civilians in Hitler's Germany, desperately hoping to avoid the wrath of the Gestapo during the war, then facing the cruelty of the postwar Russian occupation. On the eve of World War II, Garner's German-born parents went against the advice of family members and emigrated from New Jersey to Berlin with their two school-age children to enable Mr. Ramrath to take a tantalizing, two-year job offer. Readers follow Eleanor's difficult adjustment to German classrooms, her close and supportive relationship with her slightly older brother, Frank, and her loving but often strained relationship with her parents. As the political scene worsens, the family is plunged into horror, and two years stretches to seven. Not being supporters of Hitler or the Nazi Party, the Ramraths and non-Jewish citizens like them had to be constantly on guard against suspicions of disloyalty. They are dimly aware of the larger Holocaust unfolding around them. This powerful coming-of-age tale is told with intensity and also the freshness of teenage years remembered: there are repeated brutal bombings and countless brushes with death; there are also friends, holiday celebrations, and two babies born to the family during the war, who engage Eleanor's love and protection. There's also a much anticipated return to the U.S. It all coalesces into a must-have memoir about an aspect of wartime survival not often written about in children's literature.
I can't remember reading much that would be really appropriate for ten year olds and teens both, because you're really straddling a line between kid and adult with those ages.