Heinz's story goes like this - he left Germany at age 20 in 1935 for Palestine. He was joined by his mother Hedwig's half brother - Isbeth Bukofzer. Heinz immigrated to America in 1937. As stated previously, Carl came in 1939 and Hedwig in 1940; Heinz's sister Hanna never made it out.
Two of Heinz's passport pages are below:
(Click to enlarge)