The plot is about two mothers - a former Russian translator in Spain Maria Alexandrovna Fortus, the wife of the General Secretary of the Communist Party of Catalonia Ramon Casanellas, and the chairman of the Spanish Communist Party D. Ibarruri and their sons. Photos of Ramon Florian Casanelyas, son of MA Fortus and Ramon Casanelyas, who died in the skies of Spain for Republican Spain after graduating from a flight school in the Soviet Union. Florian Casanellas with friends, mother, father, in military uniform. MA Fortus at the table with letters. D. Ibarruri, a member of the Spanish Communist Party Politburo, talks about the situation in Spain during the Civil War of 1936-1939, the situation of children. D. Ibarruri goes down the plane at the airport in Volgograd, at the grave of his son Ruben, who died during the battles for Stalingrad. Photos: D. Ibarruri with Spanish children, with his son Ruben; Ruben with friends, in flight uniform, at the machine. Newsreel: Spain during the Civil War of 1936-1939. Streets of Madrid during the bombing. Running people. Type of destruction; killed. Airplanes in the sky, women with children in their arms. The Spaniards boarding and seeing off children on ships to Russia. Spanish children on the boat. Military operations during the Great Patriotic War. Bombardment. Burning houses, the ruins of Stalingrad. German cemetery, captured Germans. Types of streets in Volgograd after the war. The grave of Ruben Ibarruri in Stalingrad.