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).
Elsa Einstein
She began a relationship with her cousin Albert Einstein in April 1912, while Albert was still married to his first wife, the physicist Mileva Marić. Einstein separated from Mileva in 1914 and their divorce was final on 14 February 1919. Elsa married him three and a half months later, on 2 June 1919.