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.
Erasmus Darwin Leavitt Jr.
Leavitt was a resident of Cambridge, Massachusetts. He and his wife, the former Elizabeth Pettit, daughter of Philadelphia locomotive designer William Pettit, had five children: Mary Alford; Hart Hooker; Margaret Almira; Harriet Sherman; and Annie Louise. The astronomer Henrietta Swan Leavitt was his niece.