Hans Albert Einstein
Hans Albert Einstein was born on May 14, 1904 in Bern, Switzerland, where his father, Albert Einstein, worked as a clerk in the patent office. His father was of German-Jewish descent and his mother, Mileva Marić, Serbian-Orthodox. His younger brother, Eduard Einstein, was born in 1910 and died in 1965. The fate of his older sister, Lieserl Einstein, Albert Einstein's and Mileva Marić's first child, is unknown. Their parents divorced in 1919 after living apart for five years.
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.