Thomas Martin Einstein
Albert Einstein had three children, Lieserl Maric (1902–1903?), Hans Albert Einstein (1904–1973), and Eduard "Tete" Einstein (1910–1965), but only Hans Albert is known to have married and had children. Hans Albert's only biological child to survive to adulthood was Bernard Caesar Einstein (1930–2008), who was a physicist and the father of Thomas Martin Einstein.
Einstein family
"Lieserl's" existence was unknown to biographers until 1986, when a batch of letters between Albert and Mileva Marić was discovered by Hans Albert Einstein's daughter Evelyn.