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.
Mileva Marić
The question whether (and if so, to what extent) Marić contributed to Einstein's early work, and to the "Annus Mirabilis Papers" in particular, is the subject of debate. Many professional historians of physics argue that she made no significant scientific contribution, while others suggest that she was a supportive companion in science and may have helped him materially in his research. The couple's first son, Hans Albert, said that when his mother married Einstein, she gave up her scientific ambitions.