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).
Lewis Einstein
Einstein's diplomatic career began in 1903, when he was appointed as Third Secretary of Legation at Constantinople. The next year, he married Helen Ralli, a noted English beauty a number of years older than he, whose sister was married to the younger son of Francis Stonor, 4th Baron Camoys. This marriage led to friction between Einstein and his father, who worried that Ralli would damage the younger Einstein's career; Ralli was twice a divorcee, and divorced women could not be received in some European courts.