Ginger and Rosa (2012)

The movie is about two girls born to two friends in 1945, with the shadow of the nuclear bomb and the Cold War being cast across their childhood.  Ginger and Rosa grow up in a London of weary shortages of food, living space and cheer. The girls become the kind of friends their mothers were: Ginger, whose father Roland was a conscientious objector during World War II, and Rosa, whose father isn't in the picture.
Ginger  becomes completely swept up in the Ban the Bomb movement's marches, and in her youthful fatalism then becomes convinced the Earth is on the brink of nuclear annihilation.  Such matters are more passionate to Ginger than to Rosa and this is where the split starts to occur. Ginger's dad, Roland, takes the girls for sails on his boat, and through its thin walls, Ginger is wounded to overhear conversations that can only suggest Roland has a personal interest in Rosa, who is her age but much more intrigued by the opposite sex. 
The tensions between Roland and Ginger's mother mount, and then the whole thing unravels for Ginger in a real and awful way.  Well told story that can be a bit painful to watch, but well worth it.