The philosophy of science between the two world wars, 1920s-1930s.
It proved too hard, however, for Olga, with her inability to see, to raise Otto’s little son, and so the boy was sent to a children’s home and grew up mostly there. During the first ten years of his life, he hardly set eyes on his hyperactive father.
— Exact thinking in demented times by Karl Sigmund (Page 84)
times were tough in the early 20th century