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.
Edwin Einstein
Born in Cincinnati, Ohio, Einstein was son of Lamle 'Lewis' and Judith Einstein. He moved with his parents to New York City in 1846, worked as clerk in a store, and received a collegiate training in the College of the City of New York. He entered Union College, but did not graduate, and continued in mercantile pursuits. He married Fanny Hendricks. He went into a partnership with Louis Hirschhorn founding a cigar manufacturing business named "Hirschhorn & Einstein".