Hans Blumenfeld, my great-uncle, was the second son of Anna and Martin Jacob Blumenfeld. His older brother, Franz, was killed in WWI. His sister, Margaret, lived in the US and married Alfred Plaut. Alfred and Margaret are my grandparents (my father's parents). In Toronto, Canada after WWII, Hans continued his international career as an urban planner and established a peace foundation.
He died in 1988 and left me three drawings by Otto Freundlich.