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.
Gustav Peter Bucky
Bucky died in 1963 and he was survived by his wife Frida and two children. In 1967, Bucky's widow decided to auction off a collection of letters from Einstein to Gustav Bucky. One of Bucky's children, Peter A. Bucky, was preparing to write a memoir about the family's relationship with Einstein and he tried to buy the letters, but the collection sold for more than $35,000 and he was outbid.