Brothers during WW2

My Dad (Harry Klassen) and his brother (my uncle Dietrich Klassen) had a complicated relationship.  Before my grandfather had sold the farm in Saskatchewan in 1939, his eldest son, Dietrich, took a trip to Germany when he was in his early 20's (he was born in 1914).  The purpose of his visit was to secure funds to support the family in time of need.  My grandfather's family had retained the German language from their origins in the Mennonite colony in southern Russia.  In the 1930's, Hitler had a campaign to entice German speakers to emigrate to Germany  but it is not known if this was the purpose of his trip because he had full intentioins to return to Canada.  In 1940, Dietrich married a native German woman, Alma Hoffbauer. By this time, Germany was at war and Dietrich was soon told that he could not return to Canada but had to serve in the German army. By this time, Canada had joined Great Britain in the war with Germany. Dietrich was given a choice. He could join the German armies in the east heading towards Russia or join the armies stationed in the west in France to thwart an Allies invasion.  He chose the more perilous path to head east to avoid the possibility of encountering his brother. Dietrich's unit was involved in the siege of Leningrad. During one of the winters, Dietrich's legs were nearly frozen and he came close to having them amputated. In the meantime, my father had enlisted in the Canadian army and was part of the Allies invasion at Normandy a few weeks after D-Day, 1944. He was able to return to Toronto in the winter of 1946. After the war, Dietrich tried to return to Canada but was denied. He stayed in Germany until 1953 until he was sponsored by a distant relative to work and live near Akron, Ohio.