Thomas Martin Einstein
Albert Einstein had three children, Lieserl Maric (1902–1903?), Hans Albert Einstein (1904–1973), and Eduard "Tete" Einstein (1910–1965), but only Hans Albert is known to have married and had children. Hans Albert's only biological child to survive to adulthood was Bernard Caesar Einstein (1930–2008), who was a physicist and the father of Thomas Martin Einstein.
Albert Einstein Archives
Einstein did not save all of his written material, but from 1919, as his fame increased, he employed his stepdaughter Ilse as a secretarial assistant. Helen Dukas (1896–1982) began working for Einstein with increased systematization from April 1928, although not all outgoing correspondence was saved. After the Nazis' rise to power in 1933, Einstein's son-in-law Rudolf Kayser, aided by the French Embassy, rescued Einstein's papers in Berlin. Some of the material at Einstein's summer house in Caputh, Brandenburg was destroyed to avoid seizure, although most of his works between 1930 and 1932 were saved. That material was transported via Haberlandstrasse where Einstein lived in Berlin, then to Paris, and ended up stored in Princeton, New Jersey, United States until after Einstein's death.