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.
Alfred Einstein
While one source (1980) lists Alfred as a cousin of the scientist Albert Einstein, another claims (1993) that no relationship has been verified. Some websites claim they were both descended from a Moyses Einstein seven generations back, hence they were sixth cousins. Alfred's daughter Eva maintains that they were not related. On the other hand, Alfred's daughter Eva wrote in 2003 that they were fifth cousins on one side, and fifth cousins once removed on the other, according to research by George Arnstein. They were photographed together in 1947 when Albert Einstein received an honorary doctorate from Princeton, but they did not know that they were distantly related.