Elizabeth Roboz Einstein
Roboz married Hans Albert Einstein, first son of physicist Albert Einstein, and professor of hydraulic engineering at the University of California, Berkeley, in June 1959. They did not have any children together, although Hans had four children from his first marriage to Frieda Knecht, only two of whom survived into adulthood. Hans died on July 26, 1973, and Roboz wrote a biography of him, "Hans Albert Einstein: Reminiscences of his Life and our Life Together" (1992).
Helen Dukas
Her name was actually "Helene" and she was the daughter of a German-Jewish merchant named Leopold Dukas. Born, raised and educated initially in Freiburg im Breisgau, she had six siblings and a son named David, and her mother was named Hannchen (née Liebmann). Hannchen Dukas was coincidentally from the same town, Hechingen, that Elsa Einstein, Albert Einstein's second wife, hailed from. It was through this connection that Helen Dukas would gain the position as Albert Einstein's secretary in 1928. Following Elsa Einstein's death in 1936, Dukas would take on many of the housekeeper tasks for the Einstein family, by this point living in Princeton, New Jersey, where Dukas would remain until her death.