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
The last time "Lieserl" was mentioned in their extant correspondence was in Einstein's letter of 19 September 1903 (letter 54), in which he showed concern that she had scarlet fever. His asking "as what is the child registered? [Adding] we must take precautions that problems don't arise for her later" may indicate the intention to give the child up for adoption.