Ciekawostka: Albert Einstein and Charles Darwin both married their first cousins

Evidence: 73 • authority: 72

The Einstein family is the family of physicist Albert Einstein (1879–1955). Einstein's fourth-great-grandfather, Jakob Weil, was his oldest recorded relative, born in the late 17th century, and the family continues to this day. Albert Einstein's second-great-grandfather, Löb Moses Sontheimer (1745–1831), was also the grandfather of the tenor Heinrich Sontheim (1820–1912) of Stuttgart. Albert's three children were from his relationship with his first wife, Mileva Marić, his daughter Lieserl being born a year before they married. Albert Einstein's second wife was Elsa Einstein, whose mother Fanny Koch was the sister of Albert's mother, and whose father, Rudolf Einstein, was the son of Raphael…

Evidence: 64 • authority: 72

Elsa Einstein (18 January 1876 – 20 December 1936) was the second wife and cousin of Albert Einstein. Their mothers were sisters, making them maternal first cousins. The couple were also paternal second cousins (i.e. their fathers were first cousins). Born an Einstein, Elsa gave up the name when she took the surname of her first husband, Max Löwenthal; she and her daughters reverted to her maiden name after Elsa and Löwenthal's 1908 divorce.

Evidence: 45 • authority: 72

Mileva Marić (Serbian Cyrillic: Милева Марић, pronounced [milěːva mǎːritɕ]; 19 December 1875 – 4 August 1948), sometimes called Mileva Marić-Einstein (Милева Марић-Ајнштајн, Mileva Marić-Ajnštajn), was a Serbian mathematician and the first wife of Albert Einstein from 1903 to 1919. She was the only woman among Einstein's fellow students at Zurich Polytechnic. Marić and Einstein were study colleagues and lovers, and had a daughter Lieserl in 1902, who likely died of scarlet fever at one and a half years old. They later had two sons, Hans Albert and Eduard. The question of whether she contributed to Einstein's early work (in particular the annus mirabilis papers) has been debated.

Evidence: — • authority: 35