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.
Sergey Konenkov
In 1935 he was commissioned by the Princeton University to do a sculpture of Albert Einstein. It is said that Einstein was interested in the work of the Russian sculptor, but was more focused on his wife, Margarita Konenkova. Einstein and Margarita, who also was acquainted with the physicist Robert Oppenheimer, allegedly had a love affair, judging by the "nine of the great scientist's apparently genuine love letters, written in 1945 and 1946." There have been allegations that Margarita was working in those years for the Soviet Government, but no concrete evidence has been provided to support the theory.